Sex Differences in Methamphetamine Use and Dependence in a Thai Treatment Center.
- Authors
- Rungnirundorn, Teerayuth; Verachai, Viroj; Gelernter, Joel; Malison, Robert T; Kalayasiri, Rasmon
- Year
- 2017
- Journal
- Journal of addiction medicine
- PMID
- 27649265
- DOI
- 10.1097/ADM.0000000000000262
- PMCID
- PMC5291761
BACKGROUND AND OBJECTIVE: Males and females who use methamphetamine (MA) differ in sociodemographics, MA diagnoses, comorbidities, and brain activity. The objective of this study was to investigate sex differences in the characteristics of MA use and dependence in patients at a Thai substance treatment center. METHODS: Demographic, MA use, and diagnostic data for 782 MA users were obtained by using the Semi-Structured Assessment for Drug Dependence and Alcoholism-Thai version. Categorical comparisons of males (nβ=β413, 53%) and females (nβ=β369, 47%) were made by chi-square test. Factors significantly differentiating men and women with respect to MA-dependence were identified by logistic regression analysis controlling for demographic, diagnostic, and MA use variables. RESULTS: Males admitted to residential drug treatment for MA use had an earlier age of onset for both MA use (17.7βΒ±β4.1 vs 19.7βΒ±β6.2 years; tβ=β-5.3, Pβ<β0.001) and dependence (20.4βΒ±β5.2 vs 22.2βΒ±β6.4 years; tβ=β-3.6, Pβ<β0.001). Females were more likely than males to be MA-dependent (79% vs 60%; Ο1β=β33.7, Pβ<β0.001), and to experience MA withdrawal (65.3% vs 48.9%; Ο1β=β21.4, Pβ<β0.001), withdrawal-related hypersomnia (77.2% vs 64.8%; Ο1β=β14.5, Pβ<β0.001), fatigue (77.5% vs 70.3%; Ο1β=β5.2, Pβ=β0.02), and psychomotor retardation (64.5% vs 57.0%; Ο1β=β4.5, Pβ=β0.03). Similarly, females had heavier (eg, largest daily amount [Ο1β=β12.4, Pβ<β0.001), more frequent (Ο1β=β5.1, Pβ=β0.02]) and greater lifetime episodes of MA use (Ο1β=β24.1, Pβ<β0.001) than males. After controlling for such variables by logistic regression, being female remained a significant factor influencing the occurrence of MA-dependence (odds ratio [OR] 2.7, 95% confidence interval [CI] 1.8-4.1, Pβ<β0.001). Shared associated factors (or comorbidities) for MA-dependence in both sexes included nicotine dependence (in males: OR 4.1, 95% CI 2.4-7.0, Pβ<β0.001; and in females: OR 2.4, 95% CI 1.3-4.4, Pβ=β0.007), greater lifetime episodes of MA use (in males: OR 3.5, 95% CI 1.9-6.4, Pβ<β0.001; and in females: OR 5.9, 95% CI 3.1-11.4, Pβ<β0.001), and more frequent use (in males: OR 5.1, 95% CI 2.8-9.1, Pβ<β0.001; and in females: OR 3.6, 95% CI 1.9-6.9, Pβ<β0.001). Comorbid antisocial personality disorder predicted MA-dependence in males only (OR 3.7, 95% CI 1.6-8.6, Pβ=β0.002). CONCLUSIONS: The current study highlights both common (eg, nicotine dependence and severity of MA use) and sex-specific differences (eg, MA use/dependence characteristics and comorbidities), including sex itself, with respect to MA-dependence in a Thai treatment cohort.
Methamphetamine dependence symptoms based on DSM-IV criteria in males and females (n=782)Females, compared to males, were more likely to have higher rate of most of the DSM IV symptom criteria for substance dependence, including spending time for MA, continuing to use despite knowledge of having a persistent problem, cannot cut down or control MA use, using larger amount or longer time of MA than intended, tolerance and withdrawal symptoms.** p < 0.01, chi-square test, two-tail
Methamphetamine withdrawal symptoms in males and females (n=782)Regarding MA withdrawal symptoms, females had higher proportion of fatigue, psychomotor retardation and hypersomnia symptom than males, whereas other symptoms did not reach statistical significance.* p < 0.05, chi-square test, two-tail** p < 0.01, chi-square test, two-tail
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