Among males, there were no significant race/ethnic differences in any marijuana use or at least weekly use at any wave, save for an increase in frequency of use among Whites compared with Blacks at Wave 2 (B=0.45, 95% C.I. 0.06-0.84). Among females, Whites were more likely to use than Blacks at Waves 1-3; no significant difference was observed at Wave 4 (OR=1.27, 95% C.I. 0.93-1.73). There were no significant differences in frequency at any wave, save for an increase in frequency of use among Whites compared with Blacks at Wave 2 (B=0.64, 95% C.I. 0.22-1.07)
