|  | Model 1 | Time interactiond | Model 2 | Time interactiond | ||
---|---|---|---|---|---|---|---|
IRR (95% CI) | p-valuec | IRR (95% CI) | p-valuec | ||||
Level change | Predicted tests (n) | Â | Â | Â | Â | Â | Â |
 Pre-SUFA | 1024 (Dec 2013) | 1.00 |  |  | 1.00 |  |  |
 Post-SUFA | 1454 (Jan 2014) | 1.41 (1.25, 1.59) |  < 0.001 |  | 1.41 (1.25, 1.59) |  < 0.001 |  |
Slope | Predicted tests/month (n) | Â | Â | Â | Â | Â | Â |
 Pre-SUFA (per month) | 596 (Jan 2011–Dec 2013) | 1.04 (1.03, 1.04) |  < 0.001 |  | 1.04 (1.03, 1.04) |  < 0.001 |  |
 Post-SUFA (per month) | 1685 (Jan 2014–Dec 2016) | 1.01 (1.00, 1.01) |  < 0.001 |  | 1.01 (1.00, 1.01) |  < 0.001 |  |
Slope change | |||||||
 Time × SUFA |  | 0.97 (0.97–0.98) |  |  < 0.001 | 0.97 (0.97–0.98) |  |  < 0.001 |