Table 2.

Estimates of the Coefficients (95% Confidence Intervals) in Segmented Logistic Regression Models on Caesarean Section Rate with and Without Covariate Adjustment for Jiangsu and Inner Mongolia, Respectively, for Detecting Changes Following the Launch of China’s Two-Child Policies

	Unadjusted Coefficients for Jiangsu	Unadjusted Coefficients for Inner Mongolia
Initial level ()	2.732 (2.990, 2.484)***	0.523 (0.600, 0.445)***
Initial trend ()	0.020 (0.039, 0.002)*	0.001 (0.006, 0.004)
Level change with partial two-child policy ()	0.240 (0.735, 0.255)	0.297 (0.105, 0.489)**
Trend change with partial two-child policy ()	0.038 (0.016, 0.060)***	0.011 (0.019, 0.004)**
Level change with universal two-child policy ()	1.395 (2.937, 0.132)	1.945 (1.277, 2.614)***
Trend change with universal two-child policy ()	0.022 (0.007, 0.051)	0.034 (0.047, 0.022)***
	Adjusted Coefficients for Jiangsu	Adjusted Coefficients for Inner Mongolia
Initial level ()	2.859 (4.695, 1.636)***	1.284 (1.625, 0.959)***
Initial trend ()	0.018 (0.037, 0.000)	0.005 (0.010, 0.001)
Level change with partial two-child policy ()	0.385 (0.906, 0.135)	0.287 (0.090, 0.484)**
Trend change with partial two-child policy ()	0.020 (0.002, 0.042)	0.010 (0.017, 0.002)**
Level change with universal two-child policy ()	1.257 (2.865, 0.336)	0.758 (0.067, 1.448)*
Trend change with universal two-child policy ()	0.024 (0.006, 0.054)	0.013 (0.026, 0.000)

Notes: *5% significance; **1% significance; ***0.1% significance.