Table 4.

Differences between sexes

	Boys	Girls	P value
	n = 61	n = 61
Axial length (mm)	23.6 ± 0.9	23.1 ± 0.9	0.002
Body height (cm)	131.5 ± 5.1	133.4 ± 5.7	0.07
Body weight (kg)	28.7 ± 4.5	29.0 ± 5.2	0.68
BMI (kg/m2)	16.5 ± 1.8	16.2 ± 2.0	0.43
Indoor studying	2.6 ± 0.6	2.6 ± 0.6	0.991
Television viewing	2.6 ± 1.0	2.6 ± 0.8	0.900
Screen time	1.7 ± 0.8	1.2 ± 0.6	<0.001
Outdoor activities	1.7 ± 0.8	1.4 ± 0.5	0.015
Bed time	2.1 ± 0.6	2.2 ± 0.5	0.700
Dietary habit	2.8 ± 0.7	2.8 ± 0.7	0.787
Parental myopia	1.3 ± 0.8	1.3 ± 0.8	0.972