Table 2.

Least Square Mean Estimates From the Linear Mixed-Model Analysis for Tummy Time Duration Measured Using Parent Recall and Direct Observation (in Minutes)

Measurement Approach	Full-Term Infants (n = 19)			Preterm Infants (n = 12)
	Estimate	SE	95% CI	Estimate	SE	95% CI
Direct observation	24.7	5.36	[13.90, 35.49]	15.48	6.48	[2.44, 28.54]
Parent recall	28.21	5.48	[17.18, 39.24]	37.87	6.95	[23.93, 51.83]

Note. CI = confidence interval.