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.