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Foot periodicity in a 3-min session, measured at 10 days and 6, 12, 18, and 24 weeks in three groups of infants (LR, n = 53; HR-no diagnosis, n = 32; HR-NDD infants, n = 18). d = days; wks = weeks. Data are expressed as mean ± SEM. Periodicity is a nondimensional value.
