Table 2 Demographic characteristic of the children in cases and controls
Characteristic | Cases(n/%) (n = 330) | Controls(n/%) (n = 330) | OR (95%CI) | P-Value |
|---|---|---|---|---|
Children’s age (month old) | – | |||
< 6 | 7 (2.1) | 7 (2.1) | – | |
6–11 | 36 (10.9) | 36 (10.9) | – | |
12–23 | 91 (27.6) | 91 (27.6) | – | |
24–35 | 58 (17.6) | 58 (17.6) | – | |
36–47 | 53 (16.1) | 53 (16.1) | – | |
48–59 | 55 (16.7) | 55 (16.7) | – | |
60–71 | 30 (9.1) | 30 (9.1) | – | |
Children’s gender | 0.754 | |||
Male | 182 (55.2) | 186 (56.4) | 1(reference) | |
Female | 148 (44.8) | 144 (43.6) | 1.05 (0.77–1.43) | |
Children’s current residence | 0.111 | |||
Rural | 119 (36.1) | 139 (42.1) | 1(reference) | |
Urban | 211 (63.9) | 191 (57.9) | 1.29 (0.94–1.77) | |
Children’s family monthly income (¥) | < 0.001* | |||
< 5000 | 29 (8.8) | 69 (21.0) | 1(reference) | |
5000~ | 55 (16.7) | 129 (39.2) | 1.01 (0.59–1.74) | |
10,000~ | 193 (58.5) | 90 (27.4) | 5.10 (3.09–8.42) | |
30,000~ | 45 (13.6) | 15 (4.6) | 7.14 (3.45–14.78) | |
≥ 50,000 | 8 (2.4) | 26 (7.9) | 0.73 (0.30–1.81) | |
Scattered children | 0.273 | |||
Yes | 189 (57.3) | 175 (53.0) | 1(reference) | |
No | 141 (42.7) | 155 (47.0) | 0.84 (0.62–1.15) | |
Other children aged five and under in children’s family | 0.042* | |||
No | 168 (50.9) | 194 (58.8) | 1(reference) | |
Yes | 162 (49.1) | 136 (41.2) | 1.38 (1.01–1.87) | |
Having extra-curricular class | 0.015* | |||
No | 303 (91.8) | 283 (85.8) | 1(reference) | |
Yes | 27 (8.2) | 47 (14.2) | 0.54 (0.33–0.89) |