Study design and setting
A community-based cross-sectional study was conducted in Addis Ababa,
which is the capital of Ethiopia. The city is administratively divided
into ten sub-cities. According to 2007 national population and housing
census report, the city had an estimated population of 3,604,000
(1,703,000 males and 1,900,000 females) (CSA, 2013).