Table 1.
Incidence rate ratios for isolates with clindamycin & erythromycin resistance and tetracycline susceptibility, potential ST398, in hospitals at distances of <4000 km from NYC versus potential ST398 in hospitals >4000 km of NYC and for interaction between distance and year
| IRR | 95% CI | p-value | |
|---|---|---|---|
| Distance <50 km | 1.81 | 0.94–3.47 | 0.0741 |
| Distance 50-999 km | 1.74 | 1.01–2.96 | 0.0425 |
| Distance 1000-1999 km | 1.51 | 0.88–2.57 | 0.1283 |
| Distance 2000-2999 km | 0.96 | 0.53–1.72 | 0.8961 |
| Distance 3000-3999 m | 1.49 | 0.86–2.59 | 0.1518 |
| Distance 4000-4999 km (reference) | 1 | -- | -- |
| Year*Distance <50 km | 1.02 | 0.96–1.09 | 0.4878 |
| Year*Distance 50-999 km | 1.05 | 1.03–1.07 | <0.0001 |
| Year*Distance 1000-1999 km | 1.06 | 1.04–1.08 | <0.0001 |
| Year*Distance 2000-2999 km | 1.09 | 1.05–1.13 | <0.0001 |
| Year*Distance 3000-3999 m | 1.04 | 1.01–1.06 | 0.0047 |
| Year*Distance 4000-4999 km | 1.07 | 0.99–1.16 | 0.0629 |
*indicates interaction