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Table 3 Differences between 2016 and update systematic review

From: (Update of a) systematic review on the impact of elective early term (< 39th gestational week) caesarean sections on maternal and neonatal health - a protocol

 

Systematic review on behalf of the German Federal Ministry of Health 2016

Systematic review planned 2017

Language

German

English

Publication

Website of the German Federal Ministry of Health

International peer reviewed journal

Grey literature search

None

Google Scholar

Risk of bias assessment in non-randomized studies

Newcastle-Ottawa Scale

ROBINS-I tool for non-randomized studies

Comparison

Comparison of the 37th–38th pregnancy week to ≥ 39th pregnancy week

Time-response analysis including 37th until 42nd pregnancy week including steps of 1 week

Meta-analysis

Mantel-Haenszel test considering random effects

Time-response analysis, see section data synthesis

Software

Review Manager 5.3

R 3.3.2 + metaphor and dosresmeta package

Results

NICU admission (primary outcome): higher rate in the 37th–38th weeks group (relative risk 1.78 [95% CI 1.55, 2.06])