Comparison of the average monthly number of urine drug screen tests ordered, cost, and patient visits preintervention (January 2017–March 2018) and postintervention (April 2018–September 2019)
| Monthly averages: | Preintervention (SD) | Postintervention (SD) | P value* |
| Number of tests ordered | 159 (±17.5) | 52 (±24.5) | <0.0001 |
| Patient visits | 6247 (±414.9) | 6340 (±327.0) | =0.4785 |
| Tests/1000 patient visits | 26 (±3.6) | 8 (±3.9) | <0.0001 |
| Cost of tests/1000 patient visits† | $2465 (±356.6) | $790 (±381.6) | <0.0001 |
*P values for t-test. p<0.05 is considered significant. P values calculated using GraphPad QuickCalcs (https://www.graphpad.com/quickcalcs/).
†Cost in Canadian dollars (CAD). Individual tests cost $96.10.