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Table 4 Results of the analysis

From: One “misunderstood” health issue: demonstrating and communicating the safety of influenza a vaccination in pregnancy: a systematic review and meta-analysis

Endpoints which were assessed

RR with 95% CI

P values

Premature/Preterm birth (<  37 weeks)

0.80 [0.69–0.92]

0.002

Very preterm birth (<  32 weeks)

0.70 [0.58–0.84]

0.0001

Low birth weight (<  2500 g)

0.71 [0.49–1.04]

0.08

Very low birth weight (<  1500 g)

0.69 [0.23–2.11]

0.52

Small for gestational age

0.93 [0.83–1.05]

0.26

Stillbirth

0.63 [0.38–1.03]

0.07

Major birth defects

0.67 [0.26–1.72]

0.41

Admission to NICU

0.94 [0.87–1.02]

0.13

Apgar score < 7 in 5 min

0.89 [0.78–1.02]

0.09

  1. Abbreviations: RR Risk ratios, CI Confidence intervals, NICU Neonatal intensive care unit