Table 2 The estimate changes of national labour neuraxial analgesia rates (%) after the national policy

Single-group (all hospitals)

 Baseline intercept (β₀)

7.61

< 0.001

7.02

8.19

23.85

0.001

10.02

37.68

 Baseline slope (β₁)

0.04

< 0.001

0.02

0.06

0.15

0.010

0.03

0.26

 Intercept change (post-intervention) (β₂)

2.77

< 0.001

1.39

4.15

1.35

0.101

− 0.27

2.96

 Slope change (post-intervention) (β₃)

0.48

< 0.001

0.41

0.56

0.46

< 0.001

0.33

0.59

Single-group (pilot hospitals)

 Baseline intercept (β₀)

12.82

< 0.001

11.85

13.80

24.73

0.011

5.72

43.75

 Baseline slope (β₁)

0.03

0.029

0.00

0.06

0.14

0.055

0.00

0.27

 Intercept change (post-intervention) (β₂)

2.65

0.005

0.83

4.46

1.54

0.129

− 0.46

3.54

 Slope change (post-intervention) (β₃)

0.63

< 0.001

0.53

0.72

0.67

< 0.001

0.50

0.84

Multiple-group (Pilot and non-pilot hospitals)

 Baseline intercept of non-pilot hospitals (β₀)

4.64

< 0.001

4.24

5.05

9.36

0.039

0.48

18.23

 Baseline slope of non-pilot hospitals (β₁)

0.03

< 0.001

0.01

0.05

0.10

0.056

0.00

0.21

 Intercept change of non-pilot hospitals (post-intervention) (β₂)

2.47

< 0.001

1.36

3.58

2.16

< 0.001

1.02

3.30

 Slope change of non-pilot hospitals (post-intervention) (β₃)

0.38

< 0.001

0.34

0.42

0.40

< 0.001

0.30

0.49

 Difference of the intercept between pilot and non-pilot hospitals (prior-intervention) (β₄)

8.18

< 0.001

7.1

9.26

13.01

< 0.001

6.58

19.44

 Difference of the slope between pilot and non-pilot hospitals (prior-intervention) (β₅)

0.00

0.899

− 0.03

0.03

−0.01

0.578

− 0.04

0.02

 Difference of the change of intercept immediately following intervention between pilot and non-pilot hospitals (β₆)

0.18

0.874

− 2.02

2.38

−0.28

0.808

− 2.53

1.98

 Difference of the slope between pilot and non-pilot hospitals (post-intervention versus prior-intervention) (β₇)

0.25

< 0.001

0.15

0.35

0.23

0.001

0.09

0.37