Spearman rank correlation coefficients (rs) between HIV/syphilis prevalence and study time (2000–2011) in each subgroup.

*Comprising “Unspecified (6), Entertainment Venues and Reeducation Centers (6), Medical Institutions (1), Reeducation Centers and STD Clinics (1) and STD Clinics (1)”.†Comprising “Cohort Study (1) and Intervention Study (8)”.‡RDS: Respondent Driven Sampling.§Sorted into three groups: Confirmatory tests (ELISA + Western blot, ELISA-1 + ELISA-2, ELISA-1 + ELISA-2 + Western blot, Immunocolloidal gold + Western blot, ELISA + Immunocolloidal gold + Western blot); Single method (single ELISA); and Unspecified (exact methods not presented although diagnosis of HIV infection based on positive serological tests).||Sorted into three groups: Treponemal tests (Treponema pallidum particle agglutination assay – TPPA, Enzyme-Linked Immuno Sorbent Assay – ELISA, Treponema pallidum hemagglutination assay – TPHA, Immunocolloidal gold); Nontreponemal tests (Rapid plasma reagin – RPR, Toluidine red unheated serum test – TRUST, Unheated serum reagin – USR); and Unspecified (exact methods not presented although diagnosis of syphilis infection based on positive serological tests).