Association of Myopia in Elementary School Students in Jiaojiang District, Taizhou City, China

Table 1

Characteristics of students in two elementary schools.

Parameters	All (n = 556)			School A (n = 310)			School B (n = 246)
	Myopia (n = 354)	Normal (n = 202)	value	Myopia (n = 201)	Normal (n = 109)	value	Myopia (n = 153)	Normal (n = 93)	value
Age, mean ± SD, y	10.21 ± 0.89	9.89 ± 0.87	<0.001	10.12 ± 0.89	9.95 ± 0.84	0.112	10.33 ± 0.87	9.82 ± 0.90	<0.001
Grade, n (%)
4	102 (53.4%)	89 (46.6%)	0.001	68 (63.0%)	40 (37.0%)	0.169	34 (41.0%)	49 (59.0%)	<0.001
5	120 (65.6%)	63 (34.4%)		61 (59.8%)	41 (40.2%)		59 (72.8%)	22 (27.2%)
6	132 (72.5%)	50 (27.5%)		72 (72.0%)	28 (28.0%)		60 (73.2%)	22 (26.8%)
Gender, n (%)
Male	194 (63.2%)	113 (36.8%)	0.795	110 (63.6%)	63 (36.4%)	0.603	84 (62.7%)	50 (37.3%)	0.862
Female	160 (64.3%)	89 (35.7%)		91 (66.4%)	46 (33.6%)		69 (61.6%)	43 (38.4%)