Table 2.

A longitudinal association between the time spent outdoors of students and myopia rate at follow-up (n = 3571).

	Model 1∗		Model 2†		Model 3‡
Time spent outdoors hours/week	B	OR (95% CI)	B	OR (95% CI)	B	OR (95% CI)
Total
<7	0.272	1.313 (1.154,1.495)	0.213	1.237 (1.062–1.441)	0.223	1.250 (1.070–1.460)
7–14	−0.047	0.954 (0.826–1.102)	0.041	1.041 (0.886–1.224)	0.047	1.048 (0.890–1.234)
≥14		Reference		Reference		Reference

^∗unadjusted for any variables.

^†adjusted for students’ personal characteristics: whether the students were only-children, gender, height, weight, time in meditation (hours/week), sleep duration (hours/day), self-reported health status, etc.

^‡adjusted for students’ personal characteristics: whether the students were only-children, gender, height, weight, time in meditation (hours/week), sleep duration (hours/day), self-reported health status, etc.; students’ family characteristics: nationality, the type of area in which the family lived, whether they lived with their parents, family economic conditions, etc.