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Table 1 Outcomes reported and follow-up time period

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

Studies Fetal outcomes
Baum2015 [15] Stillbirth, early neonatal death, preterm birth, very preterm, low birth weight, fetal growth restriction, full term, live birth
Beau2014 [16] Small for gestational age, neonatal pathology, preterm birth, pregnancy loss
Chambers2013 [17] Live birth, stillbirth, termination, congenital defects
Chambers 2016 [18] Major birth defects, small for gestation, spontaneous abortion, stillbirth, live birth, termination, preterm birth
Cleary2014 [19] Small for gestation, preterm, spontaneous birth < 37 weeks, admitted to neonatal unit, perinatal death, congenital anomaly, Apgar score < 3 at 1 min, Apgar score < 7 at 5 min
Fabiani2015 [20] Stillbirth, preterm birth < 37 weeks, very preterm birth < 32 weeks, low birth weight <  2500 g, very low birth weight <  1500 g, low 5 min Apgar score < 7, congenital malformation
Fell2012 [21] Preterm birth < 37 weeks, very preterm birth < 32 weeks, small for gestation, 5 min Apgar score < 7, fetal death
Kallen2012 [22] Stillbirth, preterm birth, low birth weight, small for gestation, congenital malformation, cardiac malformation, VSD/ASD, hypospadias, orofacial clefts, eye malformations
Legge2014 [23] Preterm birth < 37 weeks, low birth weight, small for gestational age
Lin2012 [24] Preterm delivery, low birth weight, ASD, stillbirth, hyperbilirubinemia neonatal, contact dermatitis, upper respiratory tract infection, respiratory distress
Maas2015 [25] Small for gestation, preterm < 37 weeks
Olsen2016 [26] Small for gestational age, preterm
Pasternak2012 [27] Major birth defects, preterm birth, low birth weight, small for gestational age
Richards2013 [28] Preterm birth (27–36 weeks), low birth weight, small for gestational age
Rubinstein2013 [29] Preterm birth < 37 weeks, low birth weight, very low birth weight, fetal mortality, Apgar score < 7 in 5 min, admission to neonatal ICU, fetal malformation
Sheffield2012 [30] Preterm < 37 weeks, major malformation, stillborn, neonatal ICU, neonatal death, neonatal pneumonia
Steinhoff2012 [31] Small for gestational age, low birth weight, preterm < 37 weeks
Steinhoff2017 [32] Preterm < 37 weeks, small for gestation
Zerbo2017 [33] Small for gestational age, preterm birth, low birth weight, admission to neonatal ICU, Apgar score < 7 within 1 and 5 min respectively
  1. Abbreviations: ICU Intensive care unit, VSD ventricular septal defects, ASD Atrial septal defect