Reading performance Mean + standard deviation Median p
NVF+ AVF++ NVF+ AVF++
Number of errors 2.20 + 3.24 4.40 +5.54 1.00 3.00 < 0.001*
Number of errors per grade
1st
2nd
3rd
4th 		3.78 ± 4.36
1.67 ± 1.99
1.27 ± 1.27
1.17 ± 1.46 		11.10 ± 8.07
4.26 ± 4.78
2.53 ± 3.11
2.08 ± 2.74 		2.00
1.00
1.00
1.00 		9.00
3.00
2.00
1.00 		< 0.001*
< 0.001*
0.003*
0.034**
Accuracy (%) 91.05 + 16.81 80.88 + 26.21 97.06 91.18 < 0.001*
Accuracy per grade
1st
2nd
3rd
4th 		78.71 + 27.83
93.97 + 9.15
95.32 + 6.33
95.46 + 8.81 		53.19 + 29.03
83.48 + 21.95
88.87 + 22.33
93.99 + 5.36 		91.18
97.06
97.06
97.06 		60.29
91.18
94.12
94.12 		< 0.001*
< 0.001*
0.001*
0.024**
Reading speed (words per minute) 28.32 ± 16.45 23.02 ± 15.40 27.39 24.71 0.007*
Reading speed per grade
1st
2nd
3rd
4th 		13.87 ± 9.62
25.15 ± 12.45
34.19 ± 11.93
41.94 ± 14.25
 5.02 ± 5.04
17.45 ± 11.06
29.96 ± 12.90
38.21 ± 16.20 		12.30
24.24
32.54
40.00 		3.64
16.40
31.41
35.36 		< 0.001*
< 0.001*
0.113
0.031**


Table 1: Reading performance per children groups and grade
+Normal visual function; ++ Abnormal visual function; *Statistically significant differences at 1% significance level; **Statistically significant differences at 5% significance level.