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The case-crossover analysis has important implications in HIV prevention, as it draws health workers’ attention to situational factors that lead to UAI among inconsistent condom users, a group that may benefit more than consistent condom users from HIV prevention programs.Although the case-crossover design is a relatively new method, it is well established and has been used in studying different types of health-related behaviors (e.g., alcohol and drug use, first-time sexual encounter, and sex at home).Wenn du auf unsere Webseite klickst oder hier navigierst, stimmst du der Erfassung von Informationen durch Cookies auf und außerhalb von Facebook zu.
Hence, it allows researchers to investigate various event-specific risk factors to distinguish episodes of UAI from episodes of PAI.
In China, a 61-city study documented HIV prevalence of 4.9% in 2009 .
The incidence of HIV was high in China, 5.1 and 5.4 per 100 person-years in Nanjing  and Shenyang , respectively.
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Centre for Health Behaviors Research, School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, 5/F., School of Public Health, Prince of Wales Hospital, Shatin, New Territories, Hong Kong Copyright © 2014 Jinghua Li et al.The literature shows that the case-crossover study design is able to delineate the temporal relationship between variables of interest and has better control for confounding factors (e.g., participants’ characteristics), since the information is obtained from the same individuals .Thus, it is a compelling approach for investigating a causal pathway  and can minimize biases due to measured and unmeasured time-invariant potential confounders since every sampled individual serves as his own control .” This new research question cannot be answered by traditional cross-sectional analysis and logistic regression analysis, as it involves only one group of MSM (those who were inconsistent condom users).