[Changes of proportion regarding consistent condom use and syphilis infection among low-fee female sex workers aged 35 and above].

To investigate the changes of proportion on both consistent condom use and syphilis infection among low-fee female sex workers aged 35 and above (LFSW), in order to provide evidence for targeted intervention strategies. A total of six cities-Liuzhou city and Pingnan couty of Guigang city of Guangxi Zhuang Autonomous Region, Jinghong city of Xishuangbanna Dai autonomous prefecture and Dali city of Dali Bai autonomous prefecture of Yunnan province, Zhangjiajie city and Jianghua Yao autonomous county of Yongzhou city Hunan province were involved in this study, with 60 eligible participants needed in each city, estimated through a pre-study. The first cross-sectional survey was completed from October 2012 to January 2013. Face-to-face questionnaire interview was carried out to collect information on socio-demography, work-related information and condom use situation. Blood was collected for syphilis testing. The second cross-sectional survey was carried out from June to September, 2015 under the same procedure. A total of 371 and 403 eligible participants were included in the first and second survey, respectively. When comparing the two surveys, we noticed that the average age showed a slight change, from 42.4 years to 43.8 years old (=3.537, <0.001) and the average price for every commercial sex exchange increased from 36.8 RMB to 49.5 RMB (=11.961, <0.001). In the first survey, 46.9 (174/371) of the participants had more than two years of experience working as LFSW, compared to 61.3 (247/403) in the second survey ((2)=16.125, <0.001). Also, 46.9 (174/371) of the participants consistently used condoms with clients in the past month in the first survey versus 64.3 (259/403) ((2)=23.641, <0.001) in the second one. Rates of syphilis infection were found from 15.9 (59/371) in the first survey reduced to 7.2 (29/403) in the second survey ((2)=14.533, <0.001). Compared with the first survey, the proportion of consistent condoms use showed an increase. Although the proportion of syphilis infection decreased in the second survey, the scope did not meet the criteria on syphilis, set by the government. Targeted intervention strategies on condom promotion and syphilis control should be implemented consistently in this population.