Table 2.
Comparison of demographic characteristics between the two groups
| CHDs | Controls | χ2/T | P value | |
|---|---|---|---|---|
| Number of samples | 28 | 37 | ||
| Age, mean (SD) | 28.0(4.1) | 28.2(6.1) | 0.121 | 0.90 |
| Gestational age (week), mean (SD) | 27.0(5.1) | 32.2(8.7) | 2.81 | 0.01 |
| ppBMI, mean (SD) | 20.2(3.0) | 20.2(1.9) | -0.044 | 0.96 |
| Fetal gender, n(%) | ||||
| male | 10(35.7) | 23(62.2) | 4.461 | 0.04 |
| female | 18(64.3) | 14(37.8) | ||
| Gravidity, mean (SD) | 1.97(1.24) | 2.04(1.35) | -0.195 | 0.85 |
| Hospital, n(%) | ||||
| Shenzhen | 10(35.7) | 8(21.6) | 4.769 | 0.09 |
| Guangxi | 9(32.1) | 7(18.9) | ||
| Fujian | 9(32.1) | 22(59.5) | ||
| Residence, n(%) | ||||
| City | 16(57.1) | 26(70.3) | 1.201 | 0.273 |
| Subway | 12(42.9) | 11(29.7) | ||
| Factory nearby, n(%) | ||||
| Yes | 6(21.4) | 4(10.8) | 1.380 | 0.24 |
| No | 22(78.6) | 33(89.2) | ||
| Farmer, n(%) | ||||
| Yes | 1(3.6) | 1(2.7) | 0.04 | 0.841 |
| No | 27(96.4) | 36(97.3) | ||
| Secondhand tobacco, n(%) | ||||
| Yes | 11(39.3) | 18(48.6) | 0.565 | 0.452 |
| No | 17(60.7) | 19(51.4) | ||
| Folate supplement, n(%) | ||||
| Yes | 25(89.3) | 29(78.4) | 1.349 | 0.246 |
| No | 3(10.7) | 8(21.6) | ||