Table 1 Search engine and results for systematic review and meta-analysis of PTB in Ethiopia

PubMed

((((((incidence OR prevalence OR magnitude OR burden) AND Ethiopia AND (“Premature Birth/epidemiology”[Mesh] OR “Premature Birth/etiology”[Mesh] OR “Premature Birth/statistics and numerical data”[Mesh] OR premature birth* [MeSH] OR PTB OR premature birth OR preterm labo* OR preterm deliver* OR preterm infant OR preterm neonate* OR preterm newborn* OR birth outcome OR pregnancy outcome$ OR pregnancy complication$ OR birth outcome$ OR birth complication$)) AND (“2009/01/01”[PDat]: “3000/12/31”[PDat]) AND Humans [Mesh] AND English [lang])) OR (((“Premature Birth/epidemiology”[Mesh] OR “Premature Birth/etiology”[Mesh] OR “Premature Birth/statistics and numerical data”[Mesh] OR premature birth* [MeSH])) OR ((PTB OR premature birth OR preterm labo* OR preterm deliver* OR preterm infant OR preterm neonate* OR preterm newborn* OR birth outcome OR pregnancy outcome$ OR pregnancy complication$ OR birth outcome$ OR birth complication$) AND (predict* OR associated factor* OR risk factor* OR determinant*) AND Ethiopia) AND (“2009/01/01”[PDat]: “3000/12/31”[PDat]) AND Humans [Mesh] AND English [lang]))

10,783

Science Direct

((premature birth OR PTB OR pregnancy outcome OR birth complication) AND Ethiopia AND (incidence OR prevalence OR burden))

849

Science Direct

((premature birth OR PTB OR pregnancy outcome OR birth complication) AND Ethiopia AND (predictor OR associated factor OR risk factor OR determinant))

951

Google Scholar

A combination of the above key terms (preterm, premature, prevalence, proportion, magnitude, determinant, associated factor, factor, Ethiopia)

17