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sociodemographics), while the CASI asked more sensitive questions such as those on sexual practices, partner numbers and of relevance to this article, a module that asked detailed questions about the respondent's most recent partnership.
This is unfortunate since it is well established that individuals with larger numbers of partners contribute disproportionately to STI transmission in populations.
In order to address this potential bias, we have developed statistical weights for partnerships so that partnerships reported in detail can be weighted to account for partnerships lacking detailed data.
A comprehensive description of the weighting strategies developed and how they compare, at least in terms of estimating the prevalence of condom use at last sex in all partnerships, is published elsewhere in a methodology paper.
Briefly, we concluded that the choice of weighting strategy adopted resulted only in small differences in the magnitude of estimates of condom use at last sex, and minimal differences in measures of association.
To compensate for not asking respondents about all partnerships in the past year in detail, we assign weights to the partnerships with detailed data according to whether they were ongoing at interview, termed the primary weighting approach.
Specifically, partnerships that have ended (in the past year) are weighted to represent the missing (and hence less recent) partnerships for each respondent, which are assumed to have also ended.When partnerships involved an age difference of 5 years [26.2% (95% CI 23.0–29.6%) of men's and 36.5% (95% CI 33.0–40.1%) of women's partnerships], condoms were less commonly used at first sex than when partners were closer in age [44.1% (95% CI 39.1–48.4%) vs 60.8% (95% CI 57.3–64.2%)].Sex occurred within 24 h in 23.4% (95% CI 19.7–27.5%) of men's and 10.7% (95% CI 8.3–13.6%) of women's partnerships.Results Of 15 488 heterosexuals partnerships, 39.1% (95% CI 36.6–41.7%) of men's partnerships were ‘not (yet) regular’ vs 20.0% (95% CI 18.2–21.9%) of women's partnerships.While condoms were used at last sex in 37.1% (95% CI 35.0–39.3%) of men's and 28.8% (95% CI 27.1–30.6%) of women's partnerships, and for 55.3% (95% CI 52.6–58.0%) of sex with new partners, these proportions declined with age.However, an individual's most recent sexual encounter(s) at a specified interview date may be atypical for them, and for the population of all partnerships in the last year.Tags: Adult Dating, affair dating, sex dating