Analyses were conducted using Statistical Analysis Software (SAS) Version 9.1 and employed the appropriate NCS-R statistical weights to ensure that the sample was representative of the general U.S. population. Cross-tabulations were calculated to determine (a) the prevalence of current and lifetime panic psychopathology among participants who are and are not marijuana users and (b) the prevalence of current and lifetime marijuana use among participants with or without lifetime or current (past-year) panic attacks or panic disorder. Subsequently, multiple logistic regressions were performed with the marijuana and panic psychopathology variables after adjusting for sociodemographic variables of age, sex (0 = male, 1 = female), race (0 = non-Caucasian, 1 = Caucasian), education (number of years of formal schooling), income, and marital status, as well as lifetime (non-marijuana) alcohol and drug abuse/dependence (coded continuously for all nonmarijuana drugs listed in CIDI). These covariates were specified a priori on theoretical grounds and to facilitate comparability with past research (Zvolensky et al., 2006). Additional analyses were conducted that controlled for lifetime nicotine dependence in addition to the aforementioned covariates given recent findings indicating that
