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

From: Epidemiology of preterm birth in Ethiopia: systematic review and meta-analysis

Source Search Engine # of research articles
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