| Methods |
Comparative prospective intervention study |
| Participants |
422 cases urban, lower‐middle‐class breastfeeding Chilean women from Santiago: age 27.1, parity 2.0. 313 controls: age 26.8, parity 1.7. Education level of controls slightly higher |
| Interventions |
LAM breastfeeding promotion campaign; extensive health education and support; controls received "usual care". |
| Outcomes |
Cases: CPR 0.45 (1671 WMAC); CMR 18.78 (1671 WMAC). Controls: CPR 0 (690 WMAC); 52% experienced menstruation before 6 months |
| Notes |
Lactation performance better in cases than in controls. 97% of cases completed the study; number of controls that completed the study unknown |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
Unclear risk |
B ‐ Unclear |
