Longitudinal association between myopia and parental myopia and outdoor time among students in Wenzhou: a 2.5-year longitudinal cohort study

Table 3 Interaction between Time outdoors, and number of myopic parents on myopia onset of primary school children

Baseline Characteristic	Multivariate model
Baseline Characteristic	Adjusted Hazard Ratio	95% CI	p-value
Sex
Boy	1 [Reference]
Girl	1.84	1.43–2.38	< 0.001
Age	1.15	1.01–1.31	0.037
BMI	1.01	0.95–1.06	0.858
Refractive error	0.19	0.14–0.25	< 0.001
Axial length	1.60	1.33–1.93	< 0.001
Nearwork time
Low(0–2.5 h/d)	1 [Reference]
Moderate (2.5–3.5 h/d)	1.10	0.82–1.48	0.533
High(> 3.5 h/d)	1.07	0.78–1.47	0.661
Time outdoors. Moderate vs. low × Number of myopic parents. 1 vs 0	1.16	0.86–1.57	0.323
Time outdoors. High vs. low × Number of myopic parents. 1 vs 0	0.49	0.27–0.88	0.018
Time outdoors. Moderate vs. low × Number of myopic parents. 2 vs 0	1.15	0.85–1.57	0.366
Time outdoors. High vs. low × Number of myopic parents. 2 vs 0	1.14	0.76–1.72	0.536

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