Sleep, physical activity and BMI in six to ten-year-old children measured by accelerometry: a cross-sectional study

Table 3 Between-subjects correlations of stable individual differences (BLUP)

	BMI	BMI sds	Obese vs normal weight	Overweight vs normal weight	Mean activity	Time spent sedentary	Time spent in MVPA	Sleep onset (time of day)	Sleep end (time of day)	Sleep efficiency	TST
Total sleep time, TST (min)	-.085	-.099	-.042	-.039	-.068	.051	-.052	-.596	.159	-.158	1
Sleep efficiency, SE (%)	.024	-.029	.038	.019	-.233	.199	-.226	.139	.024	1
Sleep end (time of day)	-.064	-.060	-.051	-.043	-.085	.109	-.081	.692	1
Sleep onset (time of day)	.005	.018	-.009	-.014	-.025	.056	-.032	1
Time spent in MVPA (min)	-.124	-.102	-.109	-.108	.976	-.837	1
Time spent sedentary (%)	.052	.044	.052	.046	-.847	1
Mean activity (cpm)	-.115	-.096	-.100	-.107	1
Owerweight vs normal weight	.765	.710	.477	1
Obese vs normal weight	.644	.569	1
BMIsds	.914	1
BMI	1

Abbreviations: BLUP best linear unbiased predictor, TST total sleep time; SE sleep efficiency, WASO wake after sleep onset, MVPA moderate-to-vigorous physical activity, cpm counts per minute, BMIsds Body Mass Index standard deviations score, BMI body mass index. Significant correlations (p < .01) are in bold text. n = 1,160 individuals and 7,164 observations of sleep data.

ISSN: 1479-5868