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Table 3 Zou’s modified Poisson regression model coefficients estimating the risk ratios of the changes in the use of pH testing

From: Collaborating with front-line healthcare professionals: the clinical and cost effectiveness of a theory based approach to the implementation of a national guideline

First line method

Hospital

Pre intervention (%)

Post intervention (%)

Pre-intervention model coefficients with respect to the control hospital

p-value for model coefficients with respect to the control hospital

Post-intervention model coefficients with respect to the changes in risk in the control hospital

p-value for model coefficients with respect to the control hospital

    

Risk ratio (95% CI)

 

Risk ratio (95% CI)

 

pH

H1

9/49 (18.4)

30/48 (62.5)

0.41 (0.21 to 0.79)

0.007

4.43 (1.99 to 9.87)

<0.001

H2

5/43 (11.6)

32/44 (72.7)

0.26 (0.11 to 0.62)

0.002

8.14 (3.06 to 21.67)

<0.001

H3

6/44 (13.6)

13/40 (32.5)

0.30 (0.14 to 0.67)

0.003

3.1 (1.14 to 8.43)

<0.05

H4 (control)

24/53 (45.3)

16/46 (33.3)

Reference

 

0.77 (0.47 to 1.26)

0.296