Search strategy
This systematic review was registered with PROSPERO (CRD42022380418) and followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (Table S1). A systematic search was performed in online academic databases: PubMed, MEDLINE, Web of Science, and ScienceDirect. Search terms were a combination of free text and controlled vocabulary (ie, MeSH terms) for each database, including: “infertility”, “childlessness”, “sterility”, “infecundity”, “infertile”, “prevalence”, “point prevalence”, and “period prevalence” All studies published between database inception and Oct 30, 2022. To find additional potentially eligible studies, a secondary search of the gray literature was performed on Google Scholar and checked the reference lists of relevant studies.