Strategic vs nonstrategic gambling: Characteristics of pathological gamblers based on gambling preference
Department of Psychiatry, University of Minnesota, Minneapolis, MN, USA
Department of Psychiatry, University of South Florida, Tampa, FL, USA
Department of Psychiatry, University of Minnesota, Minneapolis, MN, USAJon E. Grant, JD, MD, MPH
Department of Psychiatry, University of Minnesota, Minneapolis, MN, USA
BACKGROUND: Although prior studies have examined various clinical characteristics of pathological gambling (PG), limited data exist regarding the clinical correlates of PG based on preferred forms of gambling.
METHODS: We grouped patients meeting DSM-IV criteria for pathological gambling into 3 categories of preferred forms of gambling: strategic (eg, cards, dice, sports betting, stock market), nonstrategic (eg, slots, video poker, pull tabs), or both. We then compared the groups’ clinical characteristics, gambling severity (using the Yale-Brown Obsessive Compulsive Scale Modified for Pathological Gambling, the Clinical Global Impression–Severity scale, and time and money spent gambling) and psychiatric comorbidity.
RESULTS: The 440 patients included in this sample (54.1% females; mean age 47.69±11.36 years) comprised the following groups: strategic (n=56; 12.7%), nonstrategic (n=200; 45.5%), or both (n=184; 41.8%). Nonstrategic gamblers were significantly more likely to be older and female. Money spent gambling, frequency of gambling, gambling severity, and comorbid disorders did not differ significantly among groups.
CONCLUSIONS: These preliminary results suggest that preferred form of gambling may be associated with certain age groups and sexes but is not associated with any specific clinical differences.
KEYWORDS: impulse control disorders, pathological gambling, phenomenology
ANNALS OF CLINICAL PSYCHIATRY 2011;23(2):105–112
Many people gamble as a hobby or for pleasure,1 but some individuals develop a recognizable behavioral syndrome classified as pathological gambling (PG). Epidemiologic studies estimate the prevalence of lifetime PG as 0.4% to 1.5% among adults in the United States.2-4 PG is associated with impaired functioning, financial and interpersonal problems, and health-related problems.5-7 In addition, co-occurring psychiatric conditions such as substance use (35% to 63%) and mood disorders (34% to 78%) are common in PG.4,8-10
In an effort to better characterize PG and provide insight into etiology, prevention, or treatment, we considered that comparing putative subtypes of PG might offer information regarding treatment response or disease course. Many psychiatric disorders have subtypes or course specifiers, which provide information regarding expected course and potential response to treatment. Subtypes of alcohol dependence, for example, have long been considered clinically useful11,12 and may have predictive power regarding disease course12,13 or treatment response.14,15
Thus far, only limited research has attempted to identify subtypes of PG. Moran16,17 identified 5 PG subtypes (subcultural, neurotic, impulsive, psychopathic, or symptomatic) based on observations of 50 male pathological gamblers with strategic gambling (horse/dog racing). A different study used principal component analysis to identify 4 primary factors and matched traits associated with PG: psychological distress, sensation seeking, crime and liveliness, and impulsive/antisocial behavior.18 The authors reported the presence of impulsivity and antisocial behavior as the most clinically useful, predicting the worst disease course.
Studies indicate gambling preference may be clinically significant and provide a means of subtyping individuals with PG. Historically, gambling activities have been divided into 2 groups: strategic and nonstrategic. Nonstrategic games involve little or no decision making or skill, and gamblers cannot influence the outcome of the game. Examples include slot machines, pull tabs, bingo, and keno. By contrast, strategic games allow gamblers to attempt to use knowledge of the game to influence or predict the outcome (eg, poker, blackjack, dog and horse racing, sports betting, and craps/dice games).19,20 Studies examining preferred style of gambling have found that higher rates of “action” or arousal-seeking behavior are reasons men prefer strategic forms, whereas escape from emotional trauma may underlie women’s preference for nonstrategic forms.20-22 Gamblers who prefer certain strategic gambling may have a heightened state of arousal23 and low baseline levels of endorphins.24 Additionally, recent research suggests that substance-abusing recreational gamblers prefer strategic gambling as a means of gambling for excitement.25
Although prior research suggests that gambling preference may inform our understanding of the heterogeneity of PG, these studies have been limited by the dichotomization of gambling into either strategic or nonstrategic. Many gamblers, in fact, have no gambling preference. The National Research Council found that problem gamblers were more likely than recreational gamblers to play all forms of gambling.5 This suggests that a lack of preferred gambling style might reflect more problematic gambling and thus might be worth examining.
The goal of our study was to clarify the association between preferred form of gambling and gambling symptomatology, using a large sample of treatment-seeking individuals with PG. Based on previous research,20,22,25 we hypothesized that: 1) non-strategic gambling would be more common among women; 2) a lack of preferred gambling choice would be associated with greater gambling severity; and 3) nonstrategic gambling would be associated with depressive disorders, whereas strategic gambling would be associated with substance use disorders.
Participants included adults age >18 meeting current (past 12 months) DSM-IV criteria for PG when evaluated with the Structured Clinical Interview for Pathological Gambling (SCI-PG).26 Patients were enrolled in 1 of several clinical research trials investigating the effectiveness of pharmacotherapies and psychosocial treatments for PG.27-33 Although inclusion/exclusion criteria varied from study to study, general inclusion criteria included a current DSM-IV diagnosis of PG and the ability to provide written informed consent. Persons with lifetime psychotic or bipolar disorders were excluded. Other lifetime disorders were not a reason for exclusion. Participants were recruited over a 9-year period (2000 through 2008).
The study procedures were carried out in accordance with the Declaration of Helsinki. The Institutional Review Boards of the University of Minnesota and Butler Hospital approved the studies and consent statements. All assessments were conducted by board-certified psychiatrists and psychologists familiar with PG treatment. Participants provided written informed consent after receiving a complete description of the study.
At the intake interview, board-certified psychiatrists (J.E.G., S.W.K.) assessed each participant using the Structured Clinical Interview for DSM-IV Axis I Disorders (SCID-I)34 and the Structured Clinical Interview for Pathological Gambling (SCI-PG), a valid and reliable (k=1.00) diagnostic instrument.26 In addition to a psychiatric assessment, we used a semistructured rater-administered questionnaire to collect detailed information on demographic and clinical features of PG (eg, preferred types of gambling, amount of money lost, triggers to gambling, legal and financial problems related to gambling). All patients included in this analysis were drawn from states where multiple types of gambling (ie, both strategic and nonstrategic) were available.
To determine preferred form of gambling, we asked patients as part of the semistructured clinical interview which form of gambling, if all forms were available to them, they preferred. We also told them that “no preference” was an acceptable answer. The question has not been validated. We did not give the patients a list of gambling forms from which to choose, but merely asked which form of gambling they preferred. If the form of gambling was unfamiliar to us, we researched it and placed it in one of the categories based on the criteria of whether or not the player could potentially influence the outcome through knowledge or prediction of the game. Strategic gambling consisted of poker, blackjack, dog and horse racing, sports betting, and craps/dice games; nonstrategic gambling consisted of slot machines, pull tabs, bingo, and keno. We did not ask which form of gambling they engaged in most often. Because mood state can affect gambling choice,35 we simply asked which form of gambling they preferred. Therefore, due to availability of forms of gambling, it is possible that a patient preferred 1 form of gambling and yet primarily engaged in a different form of gambling.
We assessed current PG symptom severity using 2 valid and reliable measures:
The Yale-Brown Obsessive Compulsive Scale Modified for Pathological Gambling (PG-YBOCS)—a valid and reliable 10-question, clinician-administered scale—assesses symptom severity over the past 7 days,36 with excellent inter-rater reliabilities on both the urge (ICC=0.99) and behavior (ICC=0.98) subscales.36 The first 5 items comprise the urge/thought subscale, and items 6 through 10 comprise the behavior subscale. Each item is rated on a 0 to 4 scale, with higher scores reflecting greater severity.
The Clinical Global Impression-Severity scale (CGI-S)37 is a valid and reliable 7-item scale with scores ranging from 1 (“not ill at all”) to 7 (“among the most severely ill”). The CGI-S has demonstrated excellent validity as a measure of PG symptom severity over the past 7 days.38
Based on self-report of preferred gambling type, the participants were divided into 3 groups: strategic gamblers (ie, preferred cards, dice, or sports betting), nonstrategic gamblers (ie, preferred slots, bingo, video poker, or pull-tabs), and gamblers who endorsed no preference for either strategic or nonstrategic gambling. We compared these 3 groups on demographic variables, measures of current gambling severity, and co-occurring disorders. Between-group differences were tested using 1-way ANOVAs and Pearson χ2. Because of age and sex differences, 2-way ANOVA (SPSS UNIANOVA) was used with type of gambling and sex as factors and age as a covariate for most analyses. Multinomial regressions (SPSS NOMREG) were used for primary triggers to gambling and other problems due to gambling.
All comparison tests were 2-tailed. A Bonferroni correction was used to correct for multiple comparions, yielding an α level of 0.05 to determine statistical significance. Although limited data reached statistical significance using the Bonferroni correction, we highlight statistical differences at the 0.05 α level as findings with potential clinical significance.
Four hundred and forty adults with PG (54.1% females; mean age 47.7±11.4) were included in the study. Of these, 200 (45.5%; 95% confidence interval [CI]: 40.8% to 50.2%) reported a preference for nonstrategic games, 56 (12.7%; 95% CI: 9.8% to 16.3%) preferred strategic games, and 184 (41.8%; 95% CI: 37.2% to 46.6%) reported no preference for either strategic or nonstrategic gambling.
The nonstrategic gambling group was significantly older than the other 2 groups (TABLE 1). A significant difference in sex also was noted among the groups (TABLE 1). Nonstrategic gamblers were significantly more likely to be female (71.5%) (P < .001). Strategic gamblers were more likely, on a trend level, to have at least some college education (79.6%) (P=.015).
Demographics of 440 pathological gamblers based on preferred type of gambling behavior
||Nonstrategic only n=200
||Strategic only n=56
||Both types n=184
|Age (± SD), years
High school or less
At least some college
Strategic gamblers reported significantly younger age of first gambling experience (22.5 ± 11.4 years) (P < .001). Nonstrategic gamblers were significantly more likely to gamble while feeling sad, lonely, or bored (P < .001). The groups did not differ significantly on measures of gambling severity (TABLE 2).
The rate of reported financial problems was high (78.1%) for all 3 groups. On average, the sample lost 66.8% of their gross yearly income to gambling. Financial problems did not differ significantly among groups. The percentage of gamblers reporting work-related problems (eg, late for work, decreased job performance, absenteeism) or relationship problems (eg, marital discord, not spending time with friends due to gambling) were numerically higher in the nonstrategic group. Bankruptcy (19.1%) and other legal problems (20.5%) were common throughout the sample, with no significant differences among groups.
Clinical characteristics of 440 pathological gamblers based on preferred type of gambling behavior
||Type of gambling statistica
||Type of gambling P value
||Sex P value
||Sex by gambling P value
||Age P value
|Age when started gambling, years
|Age when gambling became a problem, years
|Hours spent gambling per week
|Total amount of money lost during past year (in thousands of US dollars)
|Percentage of annual income lost to gambling during the past 12 months
|PG-YBOCS total score
|PG-YBOCS–Urge/Thought subscale score
|PG-YBOCS–Behavior subscale score
|Clinical Global Impression–Severity scale
|Primary triggers to gambling behavior, n (%)
|Problems due to gambling, n (%)
Current psychiatric comorbidity is presented in TABLE 3. We found high rates of co-occurring disorders with PG, with depressive (30.2%) and substance use (24.1%) disorders the most common. From group to group, however, we found no significant differences in comorbidity.
Current rates of psychiatric comorbidity in 440 pathological gamblers based on preferred type of gambling behavior
||Nonstrategic only (n = 200)
||Strategic only (n = 56)
||Both types (n = 184)
||Type of gambling P value
||Sex P value
||Age P value
|Any depressive disorderb
|Any anxiety disorderc
|Any substance use disorderd
|Daily nicotine use
Past studies that examined gambling preference did so as a secondary component of an analysis, with the primary focus on age39 or sex.40 This study is the first to examine a large group of treatment-seeking individuals with PG exclusively with respect to gambling preference. For this, we used a broad range of self-report and clinician-based measures. Using a larger sample than prior studies allowed us to more completely assess gambling-related thoughts and behaviors and identify between-group differences related to gambling preference.
Consistent with our first hypothesis, nonstrategic gambling was more common in women with PG. Sociability of certain forms of gambling has been reported as a factor influencing women to choose nonstrategic gambling forms.41 Strategic games such as poker may be more socially or culturally acceptable among men, with the result that women gravitate to more nonstrategic gambling forms. The nonstrategic gambling group also was significantly older than the strategic group (mean age 50.4 vs 43.8 respectively, which is consistent with previous research examining gambling preference and age.39 Thus, whether the sex issues associated with nonstrategic gambling apply equally to younger cohorts awaits further examination.
Sex differences in PG may be particularly important in terms of prevention and treatment. Although women in general gamble less than men, female gamblers have shown poorer measures of mental health when compared with male gamblers.40,42 Additionally, the association between gambling problems and co-occurring psychiatric conditions generally is stronger for women than men.42 Although the observed sex difference in gambling choice may be primarily biologic,43 previous investigations indicate significant social and cultural influences.44 Some researchers have speculated that the rapid action of slot machine gambling, for example, may contribute to the faster onset of gambling in women.20 Because women tend to progress from an initial gambling experience to a pathologic form of gambling addiction more quickly than men,20,45 understanding how preferred forms of gambling differ between women and men may aid in the development of different prevention and treatment strategies based on sex and gambling preference.
Contrary to our second hypothesis, gamblers who lacked a preference for a particular form of gambling did not report more severe gambling symptoms. Gambling preference has been associated with faster progression to problematic gambling46 and with differences between problem gambling compared to recreational gambling.47,48 Our findings, however, suggest that among pathological gamblers the preferred form of gambling is not associated with greater severity of the disorder. One possible explanation is that the range of gambling symptom severity in this sample is too narrow to detect these differences. Another explanation might be that preferred form of gambling plays a larger role in the development of a gambling problem and not in maintenance of the disorder.
Contrary to our third hypothesis, PG patients who preferred nonstrategic gambling were not significantly more likely to have a depressive disorder. Many individuals with PG gamble secondary to dysphoria, and dysphoria or depression often is associated with a desire for social isolation.49-51 Nonstrategic gambling allows a person to escape feeling sad or depressed while not interacting directly with others, and pathological gamblers with depressive symptoms have reported choosing forms of gambling that promoted this isolation.49,50,52 Although depressive disorders affected one-fourth to one-third of PG patients in this study, these rates were not significantly associated with any particular form of gambling. One possible explanation is that gambling behavior may be linked to a primary depressive disorder rather than a reflection of a primary personality feature (eg, lower risk-taking), and any form of gambling activity functions as an escape or mood elevating behavior.
Strategic gambling was not associated with higher rates of substance use disorders. Previous research on strategic gambling with psychophysiologic measures has shown increased risk-taking behavior and overall deficiencies in decision-making behaviors associated with strategic forms of gambling.53 Previous research also has found that sensation-seeking gamblers had higher rates of substance or alcohol abuse or dependence25,54 and that engaging in either gambling or substance abuse because of negative mood states is common.55 The idea of an impulsive/sensation-seeking gambler who enjoys the risk-taking associated with strategic gambling and substance use, however, was not endorsed by our data. In fact, higher rates of daily nicotine use trended toward significance in the non-strategic group (P=.023), a finding consistent with prior research.56 This difference seems largely attributable to slot machine and bingo gambling. These forms of gambling typically occur in casinos, halls, or other venues in which groups congregate. Public health concerns related to first- and second-hand smoke have led to recent restrictions on smoking within some but not all such venues. The potential impact that such restrictions have on gambling behaviors warrants investigation.
Limitations and future directions
This study has several limitations. First, no standard exists for subtyping methods of pathological gambling. Thus, our subtyping criteria were based on reported gambling preference and whether the person could potentially influence the game’s outcome through choice or the outcome was left to chance (as in slot play). Future studies could explore our criteria and the Blaszcynski and Nower (2002) pathways model, which suggests 3 subgroups of pathological gamblers based on emotional, biologic, and ecologic factors.57 Second, because a treatment-seeking sample was used the results might or might not apply to nontreatment-seeking individuals with PG. Third, lack of ethnic/racial diversity in our sample may suggest that these findings will not apply to members of different ethnic and cultural groups. Fourth, the patients were recruited over several years from a variety of venues without control groups being taken from these various settings. Although this methodology may have introduced some bias, heterogeneity of place and time may reflect “real world” gambling pathology. Fifth, the low rates of certain co-occurring disorders limit our ability to investigate the relationships between preferred form of gambling and psychiatric comorbidities. Sixth, because certain information relied upon subjective recall (eg, amount of income lost gambling) certain data may over- or under-estimate actual amounts. Seventh, the study excluded individuals with lifetime bipolar disorder. Because gambling may occur during manic episodes this study fails to capture a comorbidity that may relate to preferred form of gambling. Finally, almost 4 times as many patients endorsed nonstrategic compared with strategic forms of gambling, which may have biased our results. Despite the limitations the study has multiple strengths, including the large sample of treatment-seeking pathological gamblers and the use of both self-report and clinician-administered measures with strong psychometric properties and established norms.
Our results suggest that age and sex affect pathological gamblers’ preferred forms of gambling, but severity of gambling symptoms and psychiatric comorbidities do not. Pathological gamblers might have such high gambling symptom severity and rates of co-occurring disorders that subtyping based on gambling preference provides little information in this group. Future research could investigate whether subtyping based on gambling preference has more utility in predicting outcomes in recreational and problem gamblers as opposed to pathological gamblers.
ACKNOWLEDGEMENTS: This research was supported in part by a Career Development Award by the National Institute of Mental Health (K23 MH069754-01A1) (J.E.G.).
DISCLOSURES: Dr. Grant has received research grants from Forest Pharmaceuticals, GlaxoSmithKline, and Somaxon Pharmaceuticals. Dr. Grant has also been a consultant to Somaxon Pharmaceuticals and for law offices as an expert in pathological gambling. Mr. Odlaug and Drs. Marsh and Kim report no financial relationship with any company whose products are mentioned in this article or with manufacturers of competing products.
- Shaffer HJ, LaBrie RA, LaPlante DA, et al The road less travelled: moving from distribution to determinants in the study of gambling epidemiology. Can J Psychiatry. 2004;49:504–516.
- Cunningham-Williams RM, Cottler LB, Compton WM 3rd, et al Taking chances: problem gamblers and mental health disorders—results from the St. Louis Epidemiologic Catchment Area Study. Am J Public Health. 1998;88:1093–1096.
- Shaffer HJ, Hall MN, Vander Bilt J. Estimating the prevalence of disordered gambling behavior in the United States and Canada: a research synthesis. Am J Public Health. 1999;89:1369–1376.
- Petry NM, Stinson FS, Grant BF. Comorbidity of DSM-IV pathological gambling and other psychiatric disorders: results from the National Epidemiologic Survey on Alcohol and Related Conditions. J Clin Psychiatry. 2005;66:564–574.
- Gerstein DR, Volberg RA, Toce MT, et al Gambling impact and behavior study: Report to the National Gambling Impact Study Commission. Chicago, IL: National Opinion Research Center at the University of Chicago; 1999.
- Petry NM, Ammerman Y, Bohl J, et al Cognitive-behavioral therapy for pathological gamblers. J Consult Clin Psychol. 2006;74:555–567.
- Desai RA, Desai MM, Potenza MN. Gambling health and age: data from the National Epidemiologic Survey on Alcohol and Related Conditions. Psychol Addict Behav. 2007;21:431–440.
- McCormick RA, Russo AM, Ramirez LF, et al Affective disorders among pathological gamblers seeking treatment. Am J Psychiatry. 1984;141:215–218.
- Black DW, Moyer T. Clinical features and psychiatric comorbidity of subjects with pathological gambling behavior. Psychiatr Serv. 1998;49:1434–1439.
- Grant JE, Kim SW. Demographic and clinical features of 131 adult pathological gamblers. J Clin Psychiatry. 2001;62:957–962.
- Cloninger CR, Bohman M, Sigvardsson S. Inheritance of alcohol abuse. Cross-fostering analysis of adopted men. Arch Gen Psychiatry. 1981;38:861–868.
- Babor TF, Hofmann M, DelBoca FK, et al Types of alcoholics, I. Evidence for an empirically derived typology based on indicators of vulnerability and severity. Arch Gen Psychiatry. 1992;49:599–608.
- Schuckit MA, Anthenelli RM, Bucholz KK, et al The time course of development of alcohol-related problems in men and women. J Stud Alcohol. 1995;56:218–225.
- Litt MD, Babor TF, DelBoca FK, et al Types of alcoholics, II. Application of an empirically derived typology to treatment matching. Arch Gen Psychiatry. 1992;49:609–614.
- Kampman KM, Pettinati HM, Lynch KG, et al A double-blind, placebo-controlled pilot trial of quetiapine for the treatment of Type A and Type B alcoholism. J Clin Psychopharmacol. 2007;27:344–351.
- Moran E. Clinical and social aspects of risk-taking. Proc R Soc Med. 1970;63:1273–1277.
- Moran E. Varieties of pathological gambling. Br J Psychiatry. 1970;116:593–597.
- Steel Z, Blaszczynski A. The factorial structure of pathological gambling. J Gambl Stud. 1996;12:3–20.
- Potenza MN, Steinberg MA, McLaughlin SD, et al Illegal behaviors in problem gambling: analysis of data from a gambling helpline. J Am Acad Psychiatry Law. 2000;28:389–403.
- Potenza MN, Steinberg MA, McLaughlin SD, et al Gender-related differences in the characteristics of problem gamblers using a gambling helpline. Am J Psychiatry. 2001;158:1500–1505.
- Vitaro F, Arseneault L, Tremblay RE. Dispositional predictors of problem gambling in male adolescents. Am J Psychiatry. 1997;154:1769–1770.
- Ledgerwood DM, Petry NM. Psychological experience of gambling and subtypes of pathological gamblers. Psychiatry Res. 2006;144:17–27.
- Cocca N, Sharpe L, Blaszczynski AP. Differences in preferred level of arousal in two sub-groups of problem gamblers: a preliminary report. J Gambl Stud. 1995;11:221–229.
- Blaszczynski AP, Wilson AC, McConaghy N. Sensation seeking and pathological gambling. Br J Addict. 1986;81:113–117.
- Liu T, Maciejewski PK, Potenza MN. The relationship between recreational gambling and substance abuse/dependence: data from a nationally representative sample. Drug Alcohol Depend. 2009;100:164–168.
- Grant JE, Steinberg MA, Kim SW, et al Preliminary validity and reliability testing of a structured clinical interview for pathological gambling. Psychiatry Res. 2004; 128:79–88.
- Kim SW, Grant JE, Adson DE, et al Double-blind naltrexone and placebo comparison study in the treatment of pathological gambling. Biol Psychiatry. 2001;49:914–921.
- Kim SW, Grant JE, Adson DE, et al A double-blind placebo-controlled study of the efficacy and safety of paroxetine in the treatment of pathological gambling. J Clin Psychiatry. 2002;63:501–507.
- Grant JE, Kim SW, Potenza MN, et al Paroxetine treatment of pathological gambling: a multi-centre randomized controlled trial. Int Clin Psychopharmacol. 2003;18:243–249.
- Grant JE, Potenza MN, Hollander E, et al A multicenter investigation of the opioid antagonist nalmefene in the treatment of pathological gambling. Am J Psychiatry. 2006;163:303–312.
- Grant JE, Kim SW, Odlaug BL. N-acetyl cysteine a glutamate-modulating agent, in the treatment of pathological gambling: a pilot study. Biol Psychiatry. 2007;62:652–657.
- Grant JE, Kim SW, Hartman BK. A double-blind placebo-controlled study of the opiate antagonist, naltrexone, for the treatment of pathological gambling urges. J Clin Psychiatry. 2008;69:783–789.
- Grant JE, Donahue CJ, Odlaug BL, et al Imaginal desensitization plus motivational interviewing in the treatment of pathological gambling: a randomized controlled trial. Br J Psychiatry. 2009;195:266–267.
- First MB, Spitzer RL, Gibbon M, et al Structured Clinical Interview for DSM-IV-Patient Edition (SCID-I/P, Version 2.0). New York, NY: Biometrics Research Department, New York State Psychiatric Institute; 1995.
- Coman GJ, Evans BJ, Burrows GD. Problem gambling: Treatment strategies and rationale for use of hypnosis as a treatment adjunct. Australian Journal of Clinical and Experimental Hypnosis. 1996;24:73–91.
- Pallanti S, DeCaria CM, Grant JE, et al Reliability and validity of the pathological gambling adaptation of the Yale-Brown Obsessive-Compulsive Scale (PG-YBOCS). J Gambl Stud. 2005;21:431–443.
- Guy W. ECDEU assessment manual for psychopharmacology. Rockville MD: National Institute of Mental Health; 1976. US Department of Health, Education and Welfare publication (ADM) 76-338.
- Kim SW, Grant JE, Potenza MN, et al The Gambling Symptom Assessment Scale (G-SAS): a reliability and validity study. Psychiatry Res. 2009;166:76–84.
- Potenza MN, Steinberg MA, Wu R, et al Characteristics of older adult problem gamblers calling a gambling helpline. J Gambl Stud. 2006;22:241–254.
- Desai RA, Maciejewski PK, Pantalon MV, et al Gender differences in adolescent gambling. Ann Clin Psychiatry. 2005;17:249–258.
- Tavares H, Zilberman ML, Beites FJ, et al Gender differences in gambling progression. J Gambl Stud. 2001;17:151–159.
- Desai RA, Potenza MN. Gender differences in the associations between past-year gambling problems and psychiatric disorders. Soc Psychiatry Psychiatr Epidemiol. 2008;43:173–183.
- Pérez de Castro I, Ibáñez A, Torres P, et al Genetic association study between pathological gambling and a functional DNA polymorphism at the D4 receptor gene. Pharmacogenetics. 1997;7:345–348.
- Ladd GT, Petry NM. Gender differences among pathological gamblers seeking treatment. Exp Clin Psychopharmacol. 2002;10:302–309.
- Grant JE, Kim SW. Gender differences in pathological gamblers seeking medication treatment. Compr Psychiatry. 2002;43:56–62.
- Breen RB, Zimmerman M. Rapid onset of pathological gambling in machine gamblers. J Gambl Stud. 2002;18:31–43.
- Cox BJ, Kwong J, Michaud V, et al Problem and probable pathological gambling: considerations from a community survey. Can J Psychiatry. 2000;45:548–553.
- Cox BJ, Yu N, Afifi TO, et al A national survey of gambling problems in Canada. Can J Psychiatry. 2005;50:213–217.
- Rosenthal RJ, Lesieur HR. Self-reported withdrawal symptoms and pathological gambling. Am J Addict. 1992;1:150–154.
- McCormick RA. The importance of coping skill enhancement in the treatment of the pathological gambler. J Gambl Stud. 1994;10:77–86.
- Hollander E, Buchalter AJ, DeCaria CM. Pathological gambling. Psychiatr Clin North Am. 2000;23:629–642.
- Petry NM. Pathological gambling: etiology comorbidity, and treatment. Washington, DC: American Psychological Association; 2005.
- Hewig J, Trippe R, Hecht H, et al Decision-making in Blackjack: an electrophysiological analysis. Cereb Cortex. 2007;17:865–877.
- Pantalon MV, Maciejewski PK, Desai RA, et al Excitement-seeking gambling in a nationally representative sample of recreational gamblers. J Gambl Stud. 2008;24:63–78.
- Fischer S, Smith GT. Binge eating problem drinking, and pathological gambling: linked by common pathways to impulsive behavior. Personality and Individual Differences. 2008;44:789–800.
- Potenza MN, Steinberg MA, McLaughlin SD, et al Characteristics of tobacco-smoking problem gamblers calling a gambling helpline. Am J Addict. 2004;13:471–493.
- Blaszczynski A, Nower L. A pathways model of problem and pathological gambling. Addiction. 2002; 97:487–499.
CORRESPONDENCE: Brian L. Odlaug, University of Minnesota, Department of Psychiatry, Ambulatory, Research Center, 606 24th Avenue South, Suite 602, Minneapolis, MN 55454 USA E-MAIL: firstname.lastname@example.org
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