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Table 2 General properties of the studies

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

Studies

No of women vaccinated (n)

No of women unvaccinated (n)

Type of study

Bias risk grade

Baum2015 [15]

34,241

9363

Cohort study

B

Beau2014 [16]

1645

3290

Cohort study

B

Chambers2013 [17]

841

191

Cohort study

B

Chambers 2016 [18]

1263

467

Cohort study

B

Cleary2014 [19]

2996

3898

Cohort study

B

Fabiani2015 [20]

2003

98,329

Cohort study

B

Fell2012 [21]

23,340

32,230

Cohort study

B

Kallen2012 [22]

18,612

83,298

Cohort study

B

Legge2014 [23]

1958

10,265

Cohort study

B

Lin2012 [24]

198

198

Cohort study

B

Maas2015 [25]

1357

669

Cross sectional linkage study

B

Olsen2016 [26]

2172

2931

Cohort study

B

Pasternak2012 [27]

345 + 6644

22,917 + 46,443

Cohort study

B

Richards2013 [28]

1125

1545

Cohort study

B

Rubinstein2013 [29]

7293

23,195

Cross sectional study

B

Sheffield2012 [30]

8690

76,153

Cohort study

B

Steinhoff2012 [31]

161

166

Randomized trial

B

Steinhoff2017 [32]

1847

1846

Randomized trial

B

Zerbo2017 [33]

64,748

81,119

Cohort study

B

Total no of participants (n)

181,479

498,513