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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

From: Diffusion of clindamycin-resistant and erythromycin-resistant methicillin-susceptible Staphylococcus aureus (MSSA), potential ST398, in United States Veterans Health Administration Hospitals, 2003-2014

 

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

  1. *indicates interaction