Table 2.
Facility State | Mean weekly visits (IHS) | ILINet peak (%) | Week | IHS peak (%) | Week | Peak offset (weeks)* | Spearman correlation (r)† | p Value |
---|---|---|---|---|---|---|---|---|
AL | 31 | 3.6 | Jan 2 | 18.2 | Nov 21 | 6 | 0.13 | 0.52 |
AZ | 1352 | 10.6 | Sep 12 | 12.8 | Sep 12 | 0 | 0.77 | <0.001 |
NM1 | 235 | 16.6 | Oct 17 | 6.2 | Oct 10 | 1 | 0.52 | 0.001 |
NM2 | 305 | 19.4 | Oct 10 | 25.6 | Oct 3 | 1 | 0.86 | <0.001 |
OK1 | 116 | 8.8 | Oct 17 | 9.1 | Oct 10 | 1 | 0.42 | 0.02 |
OK2 | 98 | 33.3 | Oct 10 | 6.7 | Sep 12 | 4 | 0.37 | 0.03 |
WY | 248 | 12.3 | Oct 24 | 13.2 | Oct 17 | 1 | 0.38 | 0.08 |
All | 2723 | 9.1 | Oct 17 | 8.8 | Oct 10 | 1 | 0.66 | <0.001 |
*Difference, in weeks, of peak ILI percentage visit between the two reporting systems.
†The higher the correlation coefficient, the more similar the two systems in reporting.
HIS, Indian Health Service; ILI, influenza-like illness; ILINet, Influenza-like Illness Surveillance Network.