Table 1. The variance in the demographic information of participated families in three elementary schools.
| School A | School B | School C | χ2MH | |
|---|---|---|---|---|
| N (%) | N (%) | N (%) | ||
| Father's education level | ||||
| Illiteracy/Elementary school | 6(1.8) | 9(3.4) | 13(7.2) | 102.2**** |
| Middle school | 98(30.1) | 82(31.4) | 106(59.2) | |
| Senior school | 71(21.8) | 87(33.3) | 47(26.3) | |
| Undergraduate college | 135(41.5) | 78(29.9) | 13(7.3) | |
| Graduated college | 15(4.6) | 5(1.9) | 0(0) | |
| Mother's education level | ||||
| Illiteracy/Elementary school | 17(5.3) | 21(7.9) | 53(29.8) | 146.6**** |
| Middle school | 94(29.4) | 86(32.5) | 93(52.3) | |
| Senior school | 80(25.0) | 78(29.4) | 25(14.0) | |
| Undergraduate college | 127(39.7) | 77(29.1) | 7(3.9) | |
| Graduated college | 2(0.6) | 3(1.1) | 0(0) | |
| Annual household income (US$) | ||||
| ≤3000 | 9(2.9) | 16(6.3) | 25(15.1) | 71.3**** |
| 3000–6000 | 30(9.7) | 34(13.4) | 22(13.2) | |
| 6000–9000 | 52(16.9) | 51(20.2) | 39(23.5) | |
| 9000–12000 | 38(12.3) | 29(11.5) | 38(22.9) | |
| 12000–15000 | 63(20.5) | 38(15.0) | 26(15.7) | |
| ≥15000 | 116(37.7) | 85(33.6) | 16(9.6) | |
| Father's age | ||||
| <30 | 5(1.6) | 2(0.7) | 8(4.5) | 46.4**** |
| 30–40 | 256(80.5) | 154(58.8) | 112(62.9) | |
| 40–50 | 54(16.9) | 97(37.0) | 54(30.3) | |
| 50–60 | 3(1.0) | 9(3.5) | 4(2.2) | |
| Mother's age | ||||
| <30 | 6(1.9) | 6(2.3) | 13(7.4) | 43.5**** |
| 30–40 | 288(90.6) | 210(79.5) | 120(67.8) | |
| 40–50 | 23(7.2) | 46(17.4) | 42(23.7) | |
| 50–60 | 1(0.3) | 2(0.8) | 2(1.1) | |
| Single child | ||||
| Yes | 239(73.5) | 160(59.3) | 55(30.4) | |
| No | 86(26.5) | 110(40.7) | 126(69.6) | |
| ADHD symptoms | 1.0 | |||
| ADHD | 247(90.8) | 294(89.4) | 162(88.0) | |
| No ADHD | 25(9.2) | 35(10.6) | 22(12.0) | |
| Total | 329(41.9) | 272(34.6) | 184(23.4) |
**** p <0 .0001