Variables | Number of ultrasound scans | Pvalue | ||
---|---|---|---|---|
 | No scans | 1-2 | ≥ 3 |  |
Maternal age (years) | Â | Â | Â | < 0.001 |
≤ 23 years | 36/22.2 | 53/32.7 | 73/45.1 |  |
24-31 years | 249/23.2 | 512/47.6 | 314/29.2 | Â |
≥ 32 years | 313/28.7 | 544/50.0 | 232/21.3 |  |
Maternal education level (years) | Â | Â | Â | < 0.001 |
≤ 5 education years | 95/58.6 | 58/35.8 | 9/5.6 |  |
6-8 education years | 451/42.0 | 512/47.6 | 112/10.4 | Â |
≥ 9 education years | 317/29.1 | 573/52.6 | 199/18.3 |  |
Husband education level (years) | Â | Â | Â | < 0.001 |
≤ 5 education years | 49/30.2 | 93/57.4 | 20/12.3 |  |
6-8 education years | 233/21.7 | 675/62.8 | 167/15.5 | Â |
≥ 9 education years | 191/17.5 | 655/60.1 | 243/22.3 |  |
Family annual income (yuan) | Â | Â | Â | < 0.001 |
≤ 3000 yuan | 117/72.2 | 34/21.0 | 11/6.8 |  |
3001-7499 yuan | 614/57.1 | 294/27.3 | 167/15.5 | Â |
≥ 7500 yuan | 556/51.1 | 359/33.0 | 174/16.0 |  |
Antenatal care (n/%) * | Â | Â | Â | < 0.001 |
Yes | 17/2.0 | 294/35.4 | 519/62.5 | Â |
No | 145/9.7 | 781/52.2 | 570/38.1 | Â |
Adverse outcomes in previous pregnancy (n/%) | Â | Â | Â | 0.001 |
Yes | 11/6.7 | 54/33.1 | 98/60.1 | Â |
No | 151/7.0 | 1021/47.2 | 991/45.8 | Â |
Pregnancy complication (n/%) | Â | Â | Â | < 0.001 |
Yes | 15/2.9 | 208/40.8 | 287/56.3 | Â |
No | 147/8.1 | 867/47.7 | 802/44.2 | Â |
Primiparity (n/%) | Â | Â | Â | < 0.001 |
Yes | 74/4.7 | 681/42.9 | 834/52.5 | Â |
No | 88/11.9 | 394/53.5 | 255/34.6 | Â |
Preterm delivery (n/%) | Â | Â | Â | 0.710 |
Yes | 11/7.9 | 68/48.6 | 61/43.6 | Â |
No | 151/6.9 | 1007/46.1 | 1028/47.0 | Â |
Large for date infant (n/%) | Â | Â | Â | < 0.001 |
Yes | 31/14.0 | 93/41.9 | 98/44.1 | Â |
No | 131/6.2 | 982/46.7 | 991/47.1 | Â |
Caesarean section (n/%) | Â | Â | Â | < 0.001 |
Yes | 56/4.4 | 509/39.9 | 710/55.7 | Â |
No | 106/10.1 | 566/53.9 | 379/36.1 | Â |