Table 3.

Multivariate Analysis of Risk Factors for Developing Myopia^a

Variable	Odds Ratio (95% CI)^b
Variable	Grade 1	Grade 3	Grade 6
Age, y	6	8	11
AC/A ratio, PD/D		1.12 (1.06–1.18)^c	1.18 (1.07–1.31)^d
Axial length, mm	2.91 (2.17–3.90)^c
Crystalline lens power, D		0.85 (0.77–0.94)^c
No. of myopic parents
1			2.94 (1.51–5.76)^d
2			7.73 (3.43–17.41)^c
Corneal power, D	1.52 (1.34–1.71)^c
Visual activity, diopter-hour			0.99 (0.97–1.00)^d
Astigmatism magnitude, horizontal/vertical, D	0.45 (0.33–0.61)^c	0.26 (0.19–0.36)^c	0.15 (0.09–0.28)^c
Spherical equivalent, D	0.13 (0.10–0.16)^c	0.04 (0.03–0.06)^c	0.02 (0.01–0.03)^c

Abbreviations: AC/A, accommodative convergence to accommodation; D, diopter; PD, prism diopter.

Blank cells represent nonsignificant terms that were not included in the multivariate model for that baseline grade.

Odds ratios describe the association between risk of future myopia in any subsequent grade/age and candidate predictor variables at baseline grades 1, 3, and 6 (ages 6, 8, and 11 years, respectively) adjusted for age, sex, and race/ethnicity.

P < .001

P < .01