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Odds ratios and confidence interval bars of indirect effects of current smoking on subsequent HPV-16 infection. a) by smoking intensity (packs per day); b) by smoking duration; c) by smoking initiation relative to sexual initiation; d) indirect effects among the non-hispanic white and African American populations with never smokers in each race category as the referent group. The * by the category name indicates statistical significance at P<0.05 two-sided level.
