Su Y, Ding G, Reilly KH, Norris JL, Liu H, Li Z, Wang G, Fang G, Wang N. Loss to follow-up and HIV incidence in female sex workers in Kaiyuan, Yunnan Province China: a nine year longitudinal study. BMC infectious diseases. 2016 Sep 29;16(16). 526 p. PMID: 27686152 [PubMed] PMCID: PMC5041379
Longitudinal studies of female sex workers (FSWs) are vulnerable to loss to follow-up (LTFU) due to this population's high mobility and low willingness to self-identify as FSWs. LTFU in cohort studies is a critical problem and may lead to bias in estimation of incidence and exposure-outcome associations. The aim of this study was to analyze LTFU and HIV incidence and their associated factors in a 9-year longitudinal study of FSWs in Kaiyuan, Yunnan Province, China.