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Figure 1: Proportion of 1048 participants in the Vancouver Injection Drug Users Study who reported daily smoking of crack cocaine, by calendar year of follow-up. Odds ratio for daily use (derived from generalized estimating equations) 1.23 (95% confidence interval 1.21–1.26) per year. Period 1 = May 1, 1996, to Nov. 30, 1999; period 2 = Dec. 1, 1999, to Nov. 30, 2002; period 3 = Dec. 1, 2002, to Dec. 31, 2005.
Figure 2: Association between daily smoking of crack cocaine and HIV seroconversion. A hazard ratio above 1.0 indicates an increased risk of HIV seroconversion. Period 1 = May 1, 1996, to Nov. 30, 1999; period 2 = Dec. 1, 1999, to Nov. 30, 2002; period 3 = Dec. 1, 2002, to Dec. 31, 2005. CI = confidence interval.