|  | Model 1 | Time interactiond | Model 2 | Time interactiond | ||
---|---|---|---|---|---|---|---|
IRR (95% CI) | p-valuec | IRR (95% CI) | p-valuec | ||||
Level change | Predicted cases (n) | Â | Â | Â | Â | Â | Â |
 Pre-SUFA | 58.7 (Dec 2013) | 1.00 |  |  | 1.00 |  |  |
 Post-SUFA | 60.5 (Jan 2014) | 1.04 (0.95, 1.13) | 0.445 |  | 0.77 (0.69, 0.86) |  < 0.001 |  |
Slope | Predicted cases/month (n) | Â | Â | Â | Â | Â | Â |
 Pre-SUFA (per month) | 47.1 (Jan 2011-Dec 2013) | 1.01 (1.01, 1.02) |  < 0.001 |  | 0.97 (0.97, 0.98) |  < 0.001 |  |
 Post-SUFA (per month) | 56.3 (Jan 2014-Dec 2016) | 1.00 (1.00, 1.00) |  < 0.001 |  | 0.99 (0.98, 0.99) |  < 0.001 |  |
Slope change | |||||||
 Time × SUFA |  | 0.98 (0.98–0.99) |  |  < 0.001 | 1.01 (1.01–1.02) |  |  < 0.001 |