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| Methods | Kaiser cohort | |
| Participants | women in 4 age cohorts. CD = 389. VD = 2927. Nullips = 787 . | |
| Interventions | among other, birth history. | |
| Outcomes | AI | |
| Notes | 25 % of cohort had AI (compared to 3.3% in | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | of 12,200 assessed for eligibility, 4103 participated (33.6%) |
