One argument for a postpartum program of contraception is minimizing chances that the mother will conceive again before she can accept contraception. However early insertion increases the extent of overlap between retention of the device and anovulation when the woman is protected anyway while at the same time reducing the average span of wearing time coinciding with fecundable months when protection is needed. Thus it is not clear that early insertion yields the maximal postponement of next conception. Delaying insertion three or even six months might accomplish more. To investigate this matter, a model has been developed which incorporates the following factors: time of insertion, distribution of anovulatory length, natural fecundability and rates of effectiveness and continuation of IUD. It turns out that predicated upon the distribution of anovulatory length regarded as most realistic, the penalty of early insertion in terms of reduced postponement of next conception proves consistently small.

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