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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