Table 2. Distribution Stereoacuity in the Shandong Children Eye Study Stratified by Age, Gender, and Region of Habitation.

Age(Years)	n	Stereoacuity	≤100 arc sec	101–799 arc sec	800 arc s or >
		(Mean ± SD, arc s)	n	n	n
4	94	57.13 ± 44.13	89	5	0
5	251	48.65 ± 36.95	245	6	0
6	374	46.47 ± 17.00	370	4	0
7	637	46.69 ± 38.39	630	6	1
8	738	48.09 ± 43.52	721	16	1
9	546	49.16 ± 47.75	535	10	1
10	697	53.93 ± 64.09	669	25	3
11	587	58.31 ± 72.36	552	33	2
12	485	63.90 ± 95.67	449	31	5
13	436	47.84 ± 35.70	424	12	0
14	340	46.91 ± 28.34	332	8	0
15	227	44.23 ± 18.28	223	4	0
16	134	43.88 ± 16.86	132	2	0
17	130	52.62 ± 50.16	123	7	0
18	104	45.00 ± 16.78	103	1	0
Total	5780	50.88 ± 52.68	5597	170	13
Region/Gender
Rural boys	1551	53.29 ± 64.92	1497	47	7
Rural girls	1331	51.59 ± 52.26	1284	45	2
Urban boys	1476	50.22 ± 50.49	1432	41	3
Urban girls	1422	48.27 ± 38.38	1384	37	1
Rural	2882	52.51 ± 59.40	2781	92	9
Urban	2898	49.26 ± 44.96	2816	78	4
Boys	3027	51.79 ± 58.34	2929	88	10
Girls	2753	49.88 ± 45.64	2668	82	3