Table 2.

Summary of the NDVI^a effect at the personal level and the school level.

			Crudeb					Adjustedc
			ORd (95% CI)e		P value		OR (95% CI)e			P value
Personal myopia risk
	Within the school	0.84 (0.66-1.06)		.14		0.88 (0.75-1.04)			.15
	500 m buffer around the school	0.74 (0.61-0.89)		.001		0.84 (0.73-0.97)			.02
	1000 m buffer around the school	0.79 (0.68-0.92)		.002		0.88 (0.79-0.99)			.04
School myopia prevalence
	Within the school	0.85 (0.67-1.06)		.16		0.94 (0.79-1.11)			.44
	500 m buffer around the school	0.73 (0.61-0.87)		<.001		0.85 (0.74-0.98)			.02
	1000 m buffer around the school	0.79 (0.69-0.92)		.001		0.89 (0.80-1.01)			.05

^aNDVI: normalized difference vegetation index.

^bOdds ratios (ORs) of the NDVI (within the school, 500 m buffer around the school, 1000 m buffer around the school) regressed to the personal myopia risk or the school-level myopia prevalence without multivariable adjustment.

^cAdjusted ORs with multivariable adjustment.

^dOR: odds ratio.

^eOR (95% CI) of the NDVI within the school and of the 500 or 1000 m buffers around the school indicated a 0.1 change in value.