Table 3.

Difference in difference analysis of the proportion of children and adults who underwent a CT for evaluation of nephrolithiasis per quarter: a) incident stone episodes, b) recurrent stone episodes.

a.
CT-Rate	Pre-intervention Slope	Post-Intervention Slope	Intervention Differences	Lower Bound 95% CI	Upper Bound 95% CI	p-value
Children	5.02	−3.05	−8.07	−10.88	−5.26	<0.001
Adult	6.89	−3.42	−10.31	−12.00	−8.62	<0.001
Difference	−1.88	0.37	2.24	−1.04	5.52	0.18
b.
CT-Rate	Pre-intervention Slope	Post-Intervention Slope	Intervention Differences	Lower Bound 95% CI	Upper Bound 95% CI	p-value
Children	5.33	−0.32	−5.65	−8.92	−2.39	0.001
Adult	7.50	−1.98	−9.48	−11.05	−7.91	<0.001
Difference	−2.17	1.66	3.83	0.20	7.45	0.04