In subgroup analyses separating postpartum women who
were defined as lactating versus postpartum, stratified pooled
incidence rates among women defined as lactating (2.0, 95% CI
0.2–3.8) or postpartum (3.2, 95% CI 2.2–4.2) were not signifi-
cantly different from that of the overall postpartum population
combining these groups.