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Table 1 The results of the difference-in-difference model

From: Association of China’s two-child policy with changes in number of births and birth defects rate, 2008–2017

  Births with Shanghai and non-Shanghai household registration Births with Shanghai household registration
Estimate Std. Error P-value Estimate Std. Error P-value
Intercept 2184.94 67.49 2.00E-16 1286.04 44.94 2.00E-16
partial two-child policy 261.08 71.58 3.30E-04 150.58 47.66 1.80E-03
universal two-child policy 331.20 73.20 9.85E-06 222.63 48.75 8.18E-06
parity − 1238.40 43.54 2.00E-16 − 1098.55 28.99 2.00E-16
paritypartial two-child policy 164.56 100.88 0.10 189.82 67.18 5.15E-03
parityuniversal two-child policy 425.34 103.13 5.25E-05 331.50 68.68 2.57E-06
Jan 0 0
Feb − 152.45 88.69 0.09 −54.80 59.06 0.35
Mar 20.25 88.69 0.82 9.45 59.06 0.87
Apr − 113.70 88.69 0.20 −77.25 59.06 0.19
May −70.25 88.69 0.43 −64.95 59.06 0.27
Jun −1.05 88.69 0.99 −22.25 59.06 0.71
Jul 92.70 88.94 0.30 4.11 59.23 0.94
Aug 167.20 88.94 0.06 36.96 59.23 0.53
Sep 115.10 88.94 0.20 26.51 59.23 0.65
Oct 193.05 88.94 3.10E-02 29.31 59.23 0.62
Nov 253.60 88.94 4.76E-03 53.06 59.23 0.37
Dec 177.16 88.85 4.74E-02 30.91 59.16 0.60