Thanks for the kind words! This is a great question. There’s a lot of uncertainty here but here’s a few thoughts:
Postpartum insusceptibility is likely a decent chunk of it—i.e. some women have “redundant” protection where they were already 100% protected from pregnancy, so the modern contraception does nothing in the short term, or they were mostly protected and the modern contraception only adds a small marginal benefit
For some of the studies, there was a higher contraceptive uptake at 12 months postpartum in the intervention group than the control but the contraceptive uptake in intervention and control groups was similar at 2 years postpartum—it seems that some PPFP interventions are primarily shifting contraceptive uptake sooner, where postpartum insusceptibility is a particularly strong factor.
Behavior related to family planning is really complex and can be unpredictable/unexpected. For example, the women who start using contraception because of a program are likely not a representative sample of the population; in fact, they may be skewed towards people who are at a lower risk of getting pregnant, because they’re more careful in other ways.
Thanks for the kind words! This is a great question. There’s a lot of uncertainty here but here’s a few thoughts:
Postpartum insusceptibility is likely a decent chunk of it—i.e. some women have “redundant” protection where they were already 100% protected from pregnancy, so the modern contraception does nothing in the short term, or they were mostly protected and the modern contraception only adds a small marginal benefit
For some of the studies, there was a higher contraceptive uptake at 12 months postpartum in the intervention group than the control but the contraceptive uptake in intervention and control groups was similar at 2 years postpartum—it seems that some PPFP interventions are primarily shifting contraceptive uptake sooner, where postpartum insusceptibility is a particularly strong factor.
Behavior related to family planning is really complex and can be unpredictable/unexpected. For example, the women who start using contraception because of a program are likely not a representative sample of the population; in fact, they may be skewed towards people who are at a lower risk of getting pregnant, because they’re more careful in other ways.