The Nigeria NARHS is the first of a series of biennial surveys (through 2009). It is a nationally representative survey of 10,090 individuals (5128 women aged 15-49 and 4962 men aged 15-64), intending to provide information on the following topics: degree of preventive knowledge and behavior of HIV and other sexually transmitted infections, voluntary HIV counselling and testing, HIV/AIDS-related stigma and discrimination, maternal health, sexual behavior, family planning, female circumcision, gender violence, and reproductive health communication. The questionnaire was based on the UNAIDS general population HIV/AIDS indicator questionnaire.