Table 1.
Maternal sociodem graphic characteristics by intervention in China, 2012–2020 (N = 11,714,947)
| Singleton births characteristics, n (%) | Multiple births characteristics, n (%) | ||||||
|---|---|---|---|---|---|---|---|
| Baseline | Intervention stage | Baseline | Intervention stage | ||||
| 2012m1 –2020m1 | 2019m5–2020m1 | 2012m1 –2020m1 | 2019m5–2020m1 | ||||
| Total, n | 10,502,357 | 1,015,359 | 1,001,914 | 191,594 | 19,653 | 19,082 | |
| Maternal age (y) | |||||||
| Mean (SD) | 28.40 ± 4.97 | 29.67 ± 4.70 | 29.91 ± 4.76 | 29.53 ± 4.86 | 30.62 ± 4.57 | 30.84 ± 4.51 | |
| <35 | 9,546,633(90.90%) | 900,661(88.70%) | 881,880(88.02%) | 169989(88.72%) | 16,990(86.45%) | 16,443(86.17%) | |
| >=35 | 955724(9.10%) | 114698(11.30%) | 120,034(11.98%) | 21,605(11.28%) | 2,663(13.55%) | 2,639(13.83%) | |
| Social status | |||||||
| Advantaged | 6,286,513(59.86%) | 719,375(70.85%) | 703,031(70.17%) | 120302(62.79%) | 13,749(69.96%) | 13077(68.53%) | |
| Disadvantaged | 4,215,844(40.14%) | 295,984(29.15%) | 298,883(29.83%) | 71292(37.21) | 5,904(30.04%) | 6005(31.47%) | |
| Location | |||||||
| Rural | 4,286,165(40.81%) | 337,277(33.22%) | 350,565(34.90%) | 43,806(22.86%) | 3,367(17.13%) | 3,563(18.67%) | |
| City | 6,216,192(59.19%) | 678,082(66.78%) | 651,348(65.01%) | 147,788(77.14%) | 16,286(82.87%) | 15,519(81.335) | |
| Parity | |||||||
| Nulliparas | 5,901,659(55.24%) | 507,013(49.93%) | 488,028(48.71%) | 121,454(63.39%) | 12,508(63.64%) | 12,040(63.10%) | |
| Multiparas | 4,700,698(44.76%) | 508,346(50.07%) | 513,886(51.29) | 70,140(36.61%) | 7,145(36.36%) | 7,042(36.90%) | |
| Stillbirth | 74,703(0.71%) | 5,454(0.54%) | 5,689(0.57%) | 2,454(1.28%) | 171(0.87%) | 193(1.01%) | |
| Preterm | 619,479(5.94%) | 61,786(6.12%) | 64,357(6.46%) | 98,737(52.21%) | 10,666(54.75%) | 10,676(56.52%) | |
| Very preterm | 68,054(0.65%) | 7,116(0.70%) | 7,460(0.75%) | 10,411(5.51%) | 1,156(5.93%) | 1,155(6.11%) | |
| Moderate preterm | 83,690(0.80%) | 8,294(0.82%) | 8,383(0.84%) | 14,850(7.85%) | 1,596(8.19%) | 1,506(7.97%) | |
| Late preterm | 467,735(4.49%) | 46,376(4.59%) | 48,514(4.87%) | 73,476(38.85%) | 7914(40.63%) | 8,015(42.43%) | |
| Term | 9,702,936(93.06%) | 944,045(93.48%) | 928,581(93.21%) | 89,204(47.17%) | 8721(44.77%) | 8,135(43.07%) | |
| Post term | 99,357(0.95%) | 3,317(0.33%) | 2,533(0.25%) | 489(0.26%) | 18(0.09%) | 13(0.07%) | |
| Spontaneous preterm | 346,764(3.33%) | 31,966(3.17%) | 32,753(3.29%) | 29,207(15.44%) | 2,754(14.14%) | 2,730(14.45%) | |
| Iatrogenic preterm | 272,715(2.62%) | 29,820(2.95%) | 31,604(3.17%) | 69,530(36.77%) | 7,912(40.62%) | 7,946(42.07%) | |
SD standard deviation.
Baseline: January 1, 2012 to January 31, 2020.
Intervention stage: February 1, 2020 to December 31, 2020.