Table 2.

Prevalence of errors of visual acuity as per age of children

Age in years	Boys		Girls		Total		95% CI
	No. examined	No. with defective vision	No. examined	No. with defective vision	No. examined	No. with defective vision
10	14	1 (7.14%)	17	0 (Nil)	31	1 (3.23%)	-3.00–9.45
11	21	3 (14.29%)	17	9 (52.94%)	38	12 (31.58%)	16.80–46.36
12	16	5 (31.25%)	19	2 (10.53%)	35	7 (20.00%)	6.75–33.25
13	27	9 (33.33%)	15	5 (33.33%)	42	14 (33.33%)	19.08–47.59
14	13	2 (15.38%)	22	6 (27.27%)	35	8 (22.86%)	8.94–36.77
15	13	3 (23.08%)	10	2 (20.00%)	23	5 (21.74%)	4.88–38.60
16	11	1 (9.09%)	8	1 (12.50%)	19	2 (10.53%)	-3.28–24.33
17	8	1 (12.50%)	2	0 (Nil)	10	1 (10.00%)	-8.59–28.59
18	3	0 (Nil)	0	0 (Nil)	3	0 (Nil)	−
Total	126	25 (19.84%)	110	25 (22.73%)	236	50 (21.19%)	15.97–26.401

χ² for linear trend = 0.001, p>0.05