Table 1.

Baseline Characteristics across Experimental Groups.

Variable	Entire Sample	Control Group	Treatment Group	Difference	p-Value
Student level
Age (years)	10.507	10.547	10.487	−0.0597	0.4272
	(1.104)	(1.109)	(1.102)
Male, 1 = yes	0.485	0.496	0.48	−0.0165	0.4097
	(0.5)	(0.5)	(0.5)
Refractive error, D	−2.232	−2.277	−2.211	0.0659	0.2628
	(1.245)	(1.271)	(1.232)
Wear eyeglasses at baseline, 1 = yes	0.154	0.145	0.159	0.0134	0.4808
	(0.361)	(0.353)	(0.365)
Math score	0.239	0.244	0.236	−0.0079	0.9003
	(0.989)	(1.006)	(0.982)
MHT score	−0.034	−0.037	−0.033	0.0041	0.4025
	(1.042)	(1.048)	(1.04)
Learning anxiety score	−0.021	−0.052	−0.006	0.0461	0.948
	(1.014)	(0.999)	(1.022)
Physical anxiety score	−0.045	−0.048	−0.043	0.0047	0.9365
	(0.999)	(1.028)	(0.985)
Family level
One or both parents with > 12 years education, 1 = yes	0.206	0.203	0.207	0.0039	0.8466
	(0.404)	(0.403)	(0.405)
Family asset value, thousand RMB	32.06	30.763	32.679	1.9161	0.5567
	(35.394)	(34.215)	(35.936)
Number of observations	2851	929	1922	2851

Note: Standard deviations in parentheses.