Collecting and analyzing sex-disaggregated data is important for integrating gender in research and policy. It allows researchers to identify quantitative differences between women and men in areas like health status, education levels, employment and income. Without sex-disaggregated data, the unique needs of different gender groups may be overlooked. National and international organizations have recognized the importance of gender indicators and statistics since the 1970s. Proper methods are needed to ensure sex-disaggregated data is collected accurately from both female and male respondents.