Table 1.

Age and gender-wise distribution of stereoacuity

Age in Years	Stereoacuity	40	50	60	80	100	140	200	400	800	3,000	Total no. of Students	Mean (seconds of Arc)	SD	P Independent t-test
7	Boys	27	-	2	1	1	-	-	-	-	-	31	43.25	5.12	0.0075
	Girls	40	2	-	-	-	1	-	-	-	-	43	40.80	2.40
8	Boys	87	7	3	1	-	-	4	-	-	-	102	44.08	6.07	0.5288
	Girls	88	8	6	3	-	1	1	-	-	-	107	43.58	5.38
9	Boys	148	12	10	4	5	-	4	-	-	-	183	44.75	7.07	0.0042
	Girls	146	8	6	5	1	-	2	-	-	-	168	42.91	4.49
10	Boys	151	10	5	6	7	1	2	3	1	-	186	46.80	9.01	0.5406
	Girls	104	17	3	8	1	1	3	1	-	-	138	46.19	8.66
11	Boys	176	7	4	5	3	2	1	1	-	-	199	43.31	5.07	0.0492
	Girls	154	3	4	4	2	1	1	-	-	-	169	42.38	3.73
12	Boys	194	9	4	7	5	1	6	1	-	-	227	44.91	7.50	<0.0001
	Girls	131	2	3	2	1	1	1	-	-	-	141	41.98	3.19
13	Boys	180	5	4	7	8	1	2	-	-	-	207	43.93	6.09	0.9107
	Girls	99	2	5	5	3	-	-	1	-	-	115	44.01	6.20
14	Boys	248	4	10	8	2	2	2	2	-	1	279	44.06	6.25	0.3798
	Girls	70	3	3	1	3	1	-	-	-	-	81	43.39	5.23
All Ages	Boys	1211	54	42	39	31	7	21	7	1	1	1414	44.49	6.84	<0.0001
	Girls	832	45	30	28	11	6	8	2	-	-	962	43.32	5.08
	Total	2043	99	72	67	42	13	29	9	1	1	2376	44.01	6.11

SD=standard deviation