Read the paper at https://pophealthmetrics.biomedcentral.com/articles/10.1186/s12963-020-…
Pregnancy intention data completeness, quality and utility in population-based surveys

An estimated 40% of pregnancies globally are unintended. Measurement of pregnancy intention in low- and middle-income countries relies heavily on surveys, notably Demographic and Health Surveys (DHS), yet few studies have evaluated survey questions.