Treating the two-year observation period as approximately complete, divide total person-time at risk by two to estimate the average number of children being observed. Dividing again by the number of families gives
(1)
Thus the estimate is about 1.1 eligible children per family. This is a person-time-based approximation for children contributing to the study, not a count of older children or an exact reconstruction of family composition if follow-up or eligibility changed.

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