Wand H, Ramjee G. The relationship between age of coital debut and HIV seroprevalence among women in Durban, South Africa: a cohort study. BMJ Open 2012;2:e000285.

The following reference was omitted from the paper:

10. Wand H, Ramjee G. Combined impact of sexual risk behaviors for HIV seroconversion among women in Durban, South Africa: implications for prevention policy and planning. AIDS Behav 2011;15:479–86.

References in the manuscript should be re-numbered accordingly. In the ‘Methods’, section ‘Population attributable risk’, lines 1–3 should have read: “Although ORs and RRs may be well suited to assessment of causality, they do not provide information about the potential impact on disease occurrence by eliminating these risk factors.¹⁰”

In the ‘Potential limitations of the study’, page 7, second paragraph, the second sentence should have read: “In order to interpret a PAR as the proportion of cases caused by a risk factor and thus that could be prevented by its elimination from the target population, causality needs to be proven.¹⁰”