. 2018 May 10;136(7):731–737. doi: 10.1001/jamaophthalmol.2018.1329

Table 2. Mathematics Score, Eyeglasses Ownership, and Wear by Study Group at the Final Visit Among 949 Children.

Outcome Variables at Final Visit	Early Referral Group (n = 433)	Late Referral Group (n = 516)	P Value^a
Mathematics score, mean (SD)	0.14 (1.01)	−0.16 (0.97)	.05
Self-reported eyeglasses ownership, No. (%)	347 (80.1)	317 (61.4)	.008
Self-reported eyeglasses wear, No. (%)	326 (75.3)	286 (55.4)	.03

^{^a}

Calculated using the paired 2-sample t test.