BMC Ophthalmology

Table 2 Near work and outdoor activity time (hours per day) in Handan Offspring Myopia Study children

From: Near work, outdoor activity, and myopia in children in rural China: the Handan offspring myopia study

	N	Near work		Outdoor
	N	Mean ± SD	p value	Mean ± SD	p value
Gender
Boys	316	4.9 ± 1.7	0.042^a	3.0 ± 1.4	0.12^a
Girls	256	4.6 ± 1.5		2.8 ± 1.4
Refractive Status
Myopia	138	5.0 ± 1.7	0.049^a	2.9 ± 1.3	0.38^a
No myopia	434	4.7 ± 1.6		3.0 ± 1.4
Number of myopic parents
None	197	4.6 ± 1.7	0.32^b	2.9 ± 1.3	0.74^b
Either	272	4.9 ± 1.7		2.9 ± 1.4
Both	103	4.7 ± 1.4		3.0 ± 1.5
Maternal education levels
Illiteracy	87	4.7 ± 1.6	0.17^b	2.9 ± 1.2	0.054^b
Primary school	279	4.6 ± 1.7		2.8 ± 1.3
Junior high school	189	5.0 ± 1.5		3.2 ± 1.6
Senior high school and above	17	4.8 ± 1.6		3.1 ± 1.4
Paternal education levels
Illiteracy	21	5.4 ± 2.5	0.018^b	3.0 ± 1.1	0.38^b
Primary school	166	4.6 ± 1.6		2.8 ± 1.4
Junior high school	343	4.7 ± 1.5		3.0 ± 1.5
Senior high school and above	42	5.3 ± 2.1		2.8 ± 1.3
Total	572	4.8 ± 1.6		2.9 ± 1.4

^at-test
^bgeneralized linear models

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