Table 1.
Year | 2012–2015 | 2012 | 2013 | 2014 | 2015 |
---|---|---|---|---|---|
Total episodes | 2,277 | 242 | 405 | 672 | 958 |
Imported episodes | 1,024 | 125 | 201 | 311 | 387 |
Non-imported episodes (%) | 1,253 (55%) | 117 (48%) | 204 (50%) | 361 (54%) | 571 (60%) |
Non-imported episodes with potential infector (%) | 1,125 (90%) | 97 (83%) | 177 (87%) | 307 (85%) | 498 (87%) |
NSP distance of observed data mean [95% CI] | 5.61 [5.35–5.87] | 7.34 [6.41–8.27] | 6.15 [5.50–6.81] | 5.92 [5.43–6.40] | 4.86 [4.49–5.24] |
NSP distance of permutations mean [95% CI] | 5.89 [5.65–6.12] | 7.24 [6.46–8.02] | 6.32 [5.69–6.95] | 6.13 [5.69–6.57] | 5.35 [5.01–5.68] |
p value* | 2.71 × 10−27 | 0.14 | 0.001 | 9.78 × 10−7 | 7.17 × 10−20 |
Potential infectors were identified for a total of 1,125 episodes over the entire 2012 to 2015 period. In year-specific analyses, CPE data only contained episodes occurring from January 1st to December 31st; therefore, the search for potential infectors was restricted to this period. As a result, 128 potential infectors identified in the global analysis were not included in the stratified analyses.
NSP network-supported path.
*Wilcoxon paired rank sum test p value comparing NSP distances between observed and permuted data.