Refractive and corneal astigmatism in Chinese 4–15 years old children: prevalence and risk factors

BMC Ophthalmology

Table 2 Multivariate linear regression analysis of the factors with magnitude of RA and CA

Factors	RA (D)			CA (D)
Factors	Standardized Coefficient Beta	t	P value	Standardized Coefficient Beta	t	P value
Age (years)	−0.167	−9.656	< 0.001	−0.159	-9.216	< 0.001
Spherical power (D)	0.033	2.344	0.019	−0.054	-3.869	< 0.001
Mean corneal curvature (D)	−0.128	−10.594	< 0.001	−0.213	-17.677	< 0.001
Gender
Boy	Reference			Reference
Girl	0.059	4.891	< 0.001	0.022	1.837	0.066
Paternal myopia
No	Reference			Reference
Yes	−0.026	−2.145	0.032	−0.005	-0.419	0.675
Maternal myopia
No	Reference			Reference
Yes	−0.02	−1.582	0.114	−0.022	−1.771	0.077
Preterm birth
No	Reference			Reference
Yes	−0.002	−0.196	0.845	−0.014	−1.126	0.26
Watching TV within two meters
Almost none	Reference			Reference
Sometimes	−0.004	−0.373	0.709	−0.021	−1.743	0.081
Often	−0.007	−0.619	0.536	0.005	0.43	0.667
Continuous near work for more than 30–40 min
Almost none	Reference			Reference
Sometimes	−0.002	−0.114	0.91	−0.001	−0.085	0.932
Often	0.02	1.255	0.209	0.008	0.516	0.606
Homework time on weekdays (hour/day)	0.008	0.486	0.627	0.005	0.3	0.765
Homework time on weekends (hour/day)	−0.009	−0.551	0.582	−0.007	−0.402	0.687
Outdoor activity time on weekdays (hour/day)	0.001	0.105	0.916	−0.002	−0.165	0.869
Outdoor activity time on weekends (hour/day)	0.022	1.696	0.09	0.019	1.449	0.147
Birth weight (g)	−0.002	−0.196	0.845	−0.013	−1.093	0.274

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