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Figure 1 Derivation of study samples for sexual risk outcomes

* Respondents screened into the Sexual Behaviour Module of Canadian Community Health Survey who answered “yes,” “don’t know,” “no answer” or “not stated” to “Have you ever had sexual intercourse?” were asked subsequent questions, including “Ever had a sexually transmitted infection” and “Condom use during last intercourse”; those who responded “no” were excluded from subsequent questions in Module. Sample 2 included only respondents who had sex in past year and who were unmarried/not living common-law, or married/living common-law, but with more than one sexual partner in past year.
Source: 2005 Canadian Community Health Survey.