Table 2.

Difference in difference analysis of the proportion of children and adults who underwent a CT for evaluation of nephrolithiasis per quarter for all stone episodes (incident + recurrent stones).

CT-Rate	Pre-intervention Slope	Post-Intervention Slope	Intervention Differences	Lower Bound 95% CI	Upper Bound 95% CI	p-value
Children	5.07	−2.01	−7.08	−9.62	−4.54	<0.001
Adult	7.22	−2.82	−10.03	−11.54	−8.53	<0.001
Difference	−2.15	0.81	2.96	0.00	5.91	0.05