Sleep duration and risk of obesity among a sample of Victorian school children

BMC Public Health

Table 1 Unadjusted descriptive statistics^§

		All (N=289)	Boys (N=127)	Girls (N=162)
Age (years)		11.2 ± 1.0	11.3 ± 1.1	11.1 ± 1.0
English sole language at home (% ) ^a		87.0	86.9	87.0
SEIFA (%)*	1^st Quintile	24.6	31.1	19.8
	2^nd Quintile	27.9	27.7	28.0
	3^rd Quintile	12.0	8.4	14.7
	4^th Quintile	30.4	28.6	31.9
	5^th Quintile	5.1	4.2	5.7
BMI-z *		0.4 ± 1.1	0.6 ± 1.2	0.3 ± 1.1*
Overweight/Obese (% ) ^b*		30.5	36.2	25.9*
WC (cm) **		66.1 ± 8.7	67.6 ± 9.3	64.9 ± 8.1**
Average no of accelerometer days		5.1 ± 1.3	5.2 ± 1.3	5.1 ± 1.3
Average wear time (min.day-1)		786.1 ± 70.1	784.7 ±73.1	787.1 ±67.9
MVPA (min.day-1) **		101.0 ± 31.0	116.5 ± 29.2	88.9 ± 26.7**
Precent meeting PA Guidelines (%) **		91.4	96.9	87.0**
LPA (min.day-1)**	Total LPA	196.9 ± 33.7	191.4±28.8	201.1 ± 36.6**
	Low LPA	160.3±16.3	163.9±13.0	155.9±18.9
	Med LPA	196.3±8.2	196.6±8.4	196.1±8.0
	High LPA	233.9±19.2	220.1±12.5	236.4±21.6
ST (min.day-1) *	Total ST	487.2 ± 81.2	475.9±83.4	496.1±78.6*
	Low ST	406.8±36.9	396.2±40.8	416.7±29.8
	Med ST	481.9±15.3	480.6±16.3	482.9±14.6
	High ST	578.4±59.5	574.1±58.7	581.3±60.4
Sleep Duration (%)	<5	2.1	3.1	1.2
	5	1.0	0.8	1.2
	6	2.8	3.9	1.9
	7	3.1	3.1	3.1
	8	7.3	7.9	6.8
	9	17.0	15.0	18.5
	10	38.0	41.7	35.2
	11	18.7	12.6	23.5
	≥12	10.0	11.8	8.6
Sleep Category (%)
Insufficient (<10hrs/night)		33.2	33.9	32.7
Sufficient (≥10hrs/night)		66.8	66.1	67.3
TV in bedroom (%) ^a		31.8	33.1	30.9
Number of TVs in house (%)	<2	40.8	36.2	44.4
	3-4	40.5	43.3	38.3
	≥5	18.7	20.5	17.3
Computer/Elec. games in bedroom(%) ^a *		39.3	45.2	34.8*

§ ±3SD on BMI, waist, ST, MVPA and LPA excluded
^a Divergent number of participants: English sole language at home: N=122 for boys; TV in bedroom: N=124 for boys; Computer/Elec. Games in bedroom: N=124 for boys and N=161 for girls
^b defined by WHO World Health Organization. (1)
* p<0.05 for sex difference; ** p<0.01 for sex difference
SEIFA - Socio-Economic Indexes for Areas; WC–waist circumference; MVPA-moderate to vigorous physical activity; LPA-low intensity physical activity; ST- sedentary time
1. World Health Organization. WHO Child Growth Standards: Length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age, Methods and development. 2006

ISSN: 1471-2458