Variable | City | Suburb | Rural | Total | ||||
---|---|---|---|---|---|---|---|---|
 | n | % | n | % | n | % | n | % |
Residence | 638 | 42.0 | 347 | 22.8 | 535 | 35.2 | 1520 | 100.0 |
Maternal Age (years)* | Â | Â | Â | Â | Â | Â | Â | Â |
   <25 | 77 | 12.0 | 124 | 35.7 | 158 | 30.6 | 358 | 23.9 |
   25–29 | 383 | 60.2 | 165 | 47.6 | 255 | 49.2 | 800 | 53.5 |
   30–34 | 151 | 23.9 | 51 | 14.7 | 80 | 15.5 | 282 | 18.9 |
   ≥35 | 25 | 3.9 | 7 | 2.0 | 24 | 4.7 | 56 | 3.7 |
   Missing | 5 |  | 0 |  | 19 |  | 24 |  |
Maternal education (years)* | Â | Â | Â | Â | Â | Â | Â | Â |
   ≤9 | 57 | 9.0 | 206 | 59.4 | 282 | 53.1 | 544 | 36.0 |
   10–12 | 172 | 26.9 | 78 | 22.5 | 121 | 22.9 | 370 | 24.5 |
   >12 | 407 | 64.1 | 63 | 18.2 | 127 | 24.0 | 597 | 39.5 |
   Missing | 3 |  |  |  | 6 |  | 9 |  |
Maternal employment* | Â | Â | Â | Â | Â | Â | Â | Â |
   Labour job | 67 | 10.5 | 188 | 55.1 | 238 | 47.1 | 492 | 33.3 |
   Office job | 494 | 78.4 | 90 | 26.4 | 179 | 35.4 | 763 | 51.7 |
   Not employed | 70 | 11.1 | 63 | 18.5 | 89 | 17.4 | 221 | 15.0 |
   Missing | 8 |  | 6 |  | 30 |  | 44 |  |
Gestation (weeks)* | Â | Â | Â | Â | Â | Â | Â | Â |
   <37 | 30 | 4.7 | 7 | 2.0 | 12 | 2.4 | 49 | 3.3 |
   ≥37 | 605 | 95.3 | 340 | 98.0 | 499 | 97.6 | 1443 | 96.7 |
   Missing | 3 |  | 0 |  | 25 |  | 28 |  |
Birth weight (g) | Â | Â | Â | Â | Â | Â | Â | Â |
   <2500 | 9 | 1.4 | 7 | 2.0 | 11 | 2.1 | 27 | 1.8 |
   2500–3999 | 583 | 91.8 | 310 | 89.3 | 489 | 93.3 | 1382 | 91.8 |
   ≥4000 | 43 | 6.8 | 30 | 8.6 | 24 | 4.6 | 97 | 6.4 |
   Missing | 3 |  | 0 |  | 11 |  | 14 |  |
Delivery method* | Â | Â | Â | Â | Â | Â | Â | Â |
   Vaginal | 155 | 24.3 | 90 | 25.9 | 252 | 47.2 | 495 | 32.7 |
   Caesarean | 481 | 75.7 | 257 | 74.1 | 281 | 52.8 | 1019 | 67.3 |
   Missing | 3 |  | 0 |  | 3 |  | 6 |  |
Birth order* | Â | Â | Â | Â | Â | Â | Â | Â |
   1 | 615 | 96.9 | 290 | 84.1 | 442 | 83.4 | 1347 | 89.2 |
   ≥2 | 20 | 3.1 | 55 | 15.9 | 89 | 16.6 | 163 | 10.8 |
   Missing | 3 |  | 2 |  | 5 |  | 10 |  |
Baby's gender | Â | Â | Â | Â | Â | Â | Â | Â |
   Male | 347 | 54.2 | 162 | 47.4 | 260 | 49.7 | 767 | 51.1 |
   Female | 291 | 45.8 | 180 | 52.6 | 263 | 50.3 | 734 | 48.9 |
   Missing | 2 |  | 5 |  | 12 |  | 19 |  |
Monthly family income* (RMB) | Â | Â | Â | Â | Â | Â | Â | Â |
   ≤1500 | 6 | 1.0 | 51 | 15.0 | 158 | 31.3 | 215 | 14.6 |
   1501–3000 | 75 | 11.9 | 145 | 42.8 | 182 | 35.9 | 401 | 27.2 |
   3001–5000 | 227 | 35.7 | 97 | 28.6 | 129 | 25.6 | 451 | 30.6 |
   >5000 | 326 | 51.5 | 46 | 13.6 | 36 | 7.1 | 407 | 27.6 |
   Missing | 7 |  | 8 |  | 31 |  | 46 |  |