Differences in close-work activities and optical axis length between only children and non-only children: a cross-sectional study

Table 2 The association among the number of children in a family, the growth of AL and close-work activities

	Model 1		Model 2		Model 3
Outcome variables	OR (95% CI)	*P-value*	OR (95% CI)	*P-value*	OR (95% CI)	*P-value*
AL > 24 mm	1.452(1.245, 1.693)	< 0.001	1.370(1.156,1.625)	< 0.001	1.240(1.025,1.480)	0.028
Myopia	1.029(0.884, 1.196)	0.714	0.981(0.834, 1.154)	0.819	0.915(0.766, 1.092)	0.324
Homework on weekdays > 1 h	1.246(1.005, 1.545)	< 0.045	1.223(0.982,1.524)	0.072	1.058(0.835,1.340)	0.640
Homework on weekends > 1 h	1.308(1.048, 1.632)	0.017	1.304(1.042,1.633)	0.021	1.331(1.049,1.688)	0.019
Sleep every night > 9 h	0.788(0.624, 0.996)	0.046	0.815(0.641,1.036)	0.095	0.947(0.731,1.227)	0.681
Extracurricular classes for academic subjects ≥ 3	1.249(1.060, 1.473)	0.008	1.240(1.048,1.468)	0.012	1.068(0.901,1.355)	0.182

^*Bold text indicates a significant difference at P < 0.05. Model 1 was a binary regression model. Model 2 was adjusted for sex and grade. Model 3 was adjusted for all parameters in Model 2 and BMI, parental myopia and parental education level. OR Odds ratios, CI Confidence interval

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