Table 2

Risk of myopia onset over a 2-year period among schoolchildren in Wenzhou without myopia at baseline (N=830 at risk)

	N	n	Unadjusted ORs		Multivariable-adjusted ORs
	N	n	OR (95% CI)	P value	OR (95% CI)	P value
Age at baseline, per 1 year	601	229	1.0 (0.8 to 1.3)	0.85	0.9 (0.6 to 1.2)	0.40
Gender
Male	330	112	Reference		Reference
Female	271	117	1.3 (0.9 to 1.7)	0.12	2.2 (1.5 to 3.3)	<0.001
School
Urban			1.0 (0.8 to 1.4)	0.90
Rural			Reference
Elementary grade at baseline
2	341	116	Reference		Reference
3	260	113	1.3 (0.9 to 1.7)	0.12	1.5 (0.9 to 2.6)	0.10
Number of myopic parents
0	249	77	Reference		Reference
1	228	88	1.0 (0.8 to 1.40)	0.89	1.0 (0.7 to 1.5)	0.91
2	122	63	1.5 (1.0 to 2.1)	0.03	1.4 (0.9 to 2.2)	0.18
Spherical equivalent at baseline, per 1 myopic D	601	229	15.4 (6.5 to 36.8)	<0.001	11.5 (4.6 to 28.8)	<0.001
Axial length at baseline, per 1 mm	592	224	1.9 (1.5 to 2.4)	<0.001	2.3 (1.7 to 3.0)	<0.001
Presenting visual acuity at baseline, per 1 decimal	595	224	1.6 (1.2 to 3)	0.13	2.3 (1.1 to 4.9)	0.03
Negative relative accommodation at baseline, per 1 D	585	223	1.2 (1.0 to 1.4)	0.13
Positive relative accommodation at baseline, per 1 D	585	223	1.4 (1.3 to 1.5)	<0.001	1.4 (1.2 to 1.5)	<0.001
Near work time at baseline, per 1 hour/day	399	165	1.1 (1.0 to 1.1)	0.12	1.1 (1.0 to 1.2)	0.04
Outdoor time at baseline, per 1 hour/day	464	181	1.0 (0.9 to 1.1)	0.4	1.0 (0.9 to 1.6)	0.51