Like other longitudinal studies

[pumpui momo]

Like other longitudinal studies, Hiscock's lost touch with a number of families when it was time for the final follow-up: 101 of the original 326. That means it is theoretically possible that the sleep training did affect some children in either a negative or positive way long-term, but that their experiences weren't captured. It's more likely, though, that any effects of a single intervention simply "washed out" after six years, says Hiscock.

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