National age-of-consent laws and adolescent HIV testing in sub-Saharan Africa: a propensity-score matched study.

Objective: To estimate the association between legal age of consent and coverage of human immunodeficiency virus (HIV) testing among adolescents in countries with high HIV-burden.

Methods: We analysed data from adolescents aged 15-18 years, who participated in Demographic and Health Surveys or AIDS Indicator Surveys between 2011 and 2016, in 15 sub-Saharan African countries. To improve balance in the distribution of measured individual- and country-level characteristics, we used propensity score matching between adolescents in countries with more versus less restrictive age-of-consent laws (≤ 15 years versus ≥ 16 years). We estimated the percentage of individuals who self-reported that they have done an HIV test in the past 12 months and compared the differences in such testing rates among adolescents exposed to lower versus higher age-of-consent laws. We also investigated effect modifications by sex and age.

Findings: Legal age of consent below 16 years was associated with an 11.0 percentage points higher coverage of HIV testing (95% confidence interval, CI: 7.2 to 14.8), corresponding to a rate ratio of 1.74 (95% CI: 1.35 to 2.13). HIV testing rate had a stronger association with lower age of consent among females than males. The testing rates differences were 14.0 percentage points (95% CI: 8.6 to 19.4) for females and 6.9 percentage points (95% CI: 1.6 to 12.2) for males ( P -value for homogeneity = 0.07).

Conclusion: This study provides evidence to support the recent World Health Organization's recommendations that countries should examine current laws and address age-related barriers to uptake of sexual and reproductive health services.