Table 4. Linear multivariate regression analysis of the associations between refractive error in the worse eye and other parameters in the Beijing Pediatric Eye Study.

Parameter	P-Value	Regr. Coeff. B	Stand. Coeff. Beta	95% Conf. Interval	Variance Inflation Factor
Age (Years)	<0.001	−0.29	−0.42	−0.30, −0.27	1.82
Gender	<0.001	−0.22	−0.05	−0.29, −0.15	1.08
School Type (Key School/No Key School)	<0.001	0.28	0.06	0.19, 0.36	1.43
Family Income Per Person (<300 RMB/300-499RMB/500-799RMB/800-1499RMB/1500-2999RMB/3000-4999 RMB/5000+ RMB)	0.001	−0.04	−0.03	−0.07, −0.01	1.39
Parental Myopia (Both Not Myopic/Father Myopic or Mother Myopic/Both Myopic)	<0.001	−0.69	−0.20	−0.74, −0.63	1.19
Illumination during Studying (Table Lamp/Fluorescent Lamp/60-100 Watt Lamp/100+ Watt Lamp)	<0.001	0 09	0.03	0.05, 0.14	1.03
Daily Study Duration (<8 h/8–10 h/10–12 h/12–13 h/13+ h)	<0.001	−0.08	−0.04	−0.11, −0.04	1.21
Active Rest during Studying (Always/Often/Common/Occasionally/Never)	<0.001	0.12	−0.06	−0.15, −0.09	1.04
Duration of Television Watching (<1 h/1–2 h/2–3 h/3–4 h/4+h)	0.009	0.05	0.02	0,01, 0.08	1.10
Sleep Duration (<6 h/6–7 h/7–8 h/8–10 h/10+h)	0.002	0.08	0.02	0.03, 0.12	1.68
How Much Fruit Do You Eat Daily (A Lot/Relatively Much/Common/A Little/Very Little	0.33				1.15
How Much Protein (Including Milk, Egg, Bean Meat) Do You Eat Daily (A Lot/Relatively Much/Common/A Little/Very Little	<0.001	0.09	0.03	0.05, 0.13	1.17
How Do You Feel About Your Life and Studying (Very Good/Good/Medium/Poor/Very poor	0.02	0.05	0.02	0.01, 0.09	1.19
Do You Feel Dizzy or Tired (Very Often/Often/Commonly/Occasionally/Rarely	<0.001	0.06	0.03	0.03, 0.09	1.27
Daily Physical Exercises (No Exercise/<0.5 h/0.5–1 h/1–2 h (2+ h)	0.02	0.05	0.02	0.01, 0.09	1.10