. 2022 Sep 1;19(17):10923. doi: 10.3390/ijerph191710923

Table 2.

Impact of providing eyeglasses on endline standardized mathematics score (ITT).

Dep. Var.: Endline Standardized Math Score	(1)	(2)	(3)	(4)
	Unadjusted	Adjusted	Unadjusted	Adjusted
Treatment (1 = free eyeglasses)	0.060 ***	0.062 ***	0.023	0.023
Treatment (1 = free eyeglasses)	(0.043)	(0.043)	(0.047)	(0.051)
Province (1 = Gansu)	−0.037	−0.050	−0.006	−0.059
Province (1 = Gansu)	(0.146)	(0.160)	(0.152)	(0.170)
Treatment × Province (1 = Gansu)			0.077 **	0.081 **
Treatment × Province (1 = Gansu)			(0.089)	(0.088)
Treatment effect for Gansu			0.122 ***	0.123 ***
Treatment effect for Gansu			(0.076)	(0.076)
Treatment effect for Shaanxi			0.023	0.031
Treatment effect for Shaanxi			(0.047)	(0.048)
Baseline standardized math score controlled	Yes	Yes	Yes	Yes
student, family, teacher, characteristics controlled	-	Yes	-	Yes
Number of observations	2087	2087	2087	2087
R-square	0.397	0.408	0.399	0.411

Notes: Full sample is analyzed. Standardized coefficients are reported. Standard errors clustered at the school level are reported in parentheses. ** p < 0.05, *** p < 0.01.