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Table 2 Segmented logistic regression analysis of care bundles for AMI and stroke: all sites combined, allowing for a ramp-up period of 12 weeks after introduction of the intervention

From: The use of segmented regression in analysing interrupted time series studies: an example in pre-hospital ambulance care

Parameter Odds ratio (OR) 95% confidence interval for OR p-value
AMI    
Pre-intervention slope (secular trend, per month) 1.02 0.97 to 1.07 0.362
Change in intercept (immediate effect) 1.16 0.93 to 1.44 0.199
Change in slope (gradual effect, per month) 1.02 0.97 to 1.08 0.346
Stroke    
Pre-intervention slope (secular trend, per month) 1.05 1.00 to 1.10 0.045
Change in intercept (immediate effect) 0.93 0.73 to 1.19 0.577
Change in slope (gradual effect, per month) 1.02 0.97 to 1.07 0.551