Table 1 Twinning rate, Stillbirth, SGA and low apgar score rate (%) and its annual change in China, 2012–2020
Year a | Annual rate change (95% CI) b | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | ||
Twin born rate | ||||||||||
overall | 2.84 | 2.95 | 3.02 | 3.17 | 3.03 | 3.05 | 3.28 | 3.37 | 3.22 | 1.75%[1.57%,1.93%] |
28-31w | 15.19 | 15.70 | 17.89 | 17.48 | 17.68 | 17.35 | 18.30 | 19.73 | 18.91 | 2.66%[2.02%,3.30%] |
32-33w | 20.21 | 20.68 | 22.24 | 22.16 | 22.62 | 22.34 | 23.59 | 24.84 | 23.52 | 2.17%[1.64%,2.71%] |
34-36w | 19.33 | 20.46 | 21.26 | 21.81 | 21.07 | 22.08 | 23.49 | 23.82 | 22.63 | 2.19%[1.95%,2.44%] |
37-38w | 4.30 | 4.60 | 4.71 | 4.99 | 4.46 | 4.46 | 4.76 | 4.97 | 4.24 | 0.19%[-0.08%,0.46%] |
≥ 39w | 0.50 | 0.47 | 0.42 | 0.40 | 0.32 | 0.29 | 0.24 | 0.20 | 0.14 | -13.11%[-13.76%,-12.46%] |
Stillbirth | ||||||||||
overall | 2.20 | 2.30 | 2.10 | 1.86 | 1.71 | 1.53 | 1.44 | 1.29 | 1.40 | -7.35%[-8.35%,-6.24%] |
28-31w | 12.16 | 12.85 | 10.55 | 10.48 | 9.68 | 7.05 | 8.46 | 7.18 | 7.82 | -7.16%[-9.05%,-5.24%] |
32-33w | 4.41 | 4.79 | 4.32 | 3.71 | 3.79 | 3.61 | 3.45 | 2.69 | 3.40 | -5.38%[-7.86%,-2.83%] |
34-36w | 1.74 | 1.94 | 1.81 | 1.39 | 1.23 | 1.32 | 1.00 | 0.92 | 0.90 | -9.72%[-11.41%,-8.00%] |
37-38w | 1.03 | 0.98 | 0.92 | 0.84 | 0.71 | 0.66 | 0.55 | 0.55 | 0.55 | -9.05%[-11.27%,-6.78%] |
≥ 39w | 1.96 | 1.71 | 1.55 | 1.98 | 1.81 | 1.81 | 2.14 | 1.89 | 3.00 | 2.97%[-1.31%,7.43%] |
SGA | ||||||||||
overall | 8.91 | 8.74 | 8.09 | 7.97 | 7.85 | 7.29 | 7.11 | 6.81 | 6.69 | -3.67%[-4.14%,-3.21%] |
28-31w | 8.85 | 8.99 | 8.78 | 9.10 | 8.92 | 7.41 | 8.25 | 7.86 | 9.32 | -0.92%[-2.78%,0.99%] |
32-33w | 9.70 | 10.55 | 10.04 | 10.06 | 10.37 | 9.21 | 10.24 | 9.83 | 8.82 | -0.99%[-2.42%,0.45%] |
34-36w | 9.39 | 9.23 | 8.50 | 8.49 | 8.32 | 7.47 | 7.14 | 7.35 | 6.84 | -3.96%[-4.67%,-3.25%] |
37-38w | 7.98 | 7.68 | 7.31 | 6.87 | 6.53 | 6.39 | 6.22 | 5.47 | 5.59 | -4.64%[-5.42%,-3.85%] |
≥ 39w | 10.37 | 10.02 | 8.24 | 9.14 | 10.33 | 10.28 | 9.24 | 9.34 | 10.79 | -0.02%[-2.00%,1.99%] |
Low apgar score (< 4) | ||||||||||
overall | 1.09 | 1.01 | 0.94 | 0.85 | 0.87 | 0.76 | 0.58 | 0.55 | 0.54 | -8.70%[-10.18%,-7.18%] |
28-31w | 7.70 | 9.11 | 7.50 | 6.96 | 6.36 | 6.26 | 6.12 | 4.26 | 4.91 | -7.56%[-10.03%,-5.02%] |
32-33w | 2.40 | 1.82 | 2.04 | 2.02 | 2.24 | 2.13 | 1.42 | 1.74 | 1.05 | -5.39%[-8.95%,-1.68%] |
34-36w | 0.85 | 0.67 | 0.60 | 0.53 | 0.53 | 0.51 | 0.25 | 0.30 | 0.32 | -11.71%[-15.06%,-8.22%] |
37-38w | 0.45 | 0.34 | 0.31 | 0.23 | 0.28 | 0.13 | 0.11 | 0.09 | 0.11 | -17.61%[-21.73%,-13.26%] |
≥ 39w | 0.61 | 0.61 | 0.50 | 0.70 | 0.74 | 0.61 | 0.35 | 0.50 | 0.27 | -2.84%[-10.35%,5.31%] |