Table 4.

 Logistic regression model of factors potentially associated with failure to achieve visual acuity of 6/7.5 with self refraction in right eyes with uncorrected visual acuity ≤6/12 among young people in rural China

Independent variable	Odds ratio (95% CI)	P value
Spherical power (dioptres)	2.78 (1.84 to 4.21)	<0.001
Cylinder power (dioptres)	14.1 (3.33 to 59.3)	0.001
Age (years)	0.37 (0.11 to 1.20)	0.093
Female sex	0.52 (0.13 to 2.10)	0.348
Not wearing spectacles at baseline	19.8 (3.35 to 117.2)	0.002