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 |