Table 1.
Comparison of weekly pet cases by elevation of owner residence*
| Elevation (m) | Mean onset week | No. weeks with cases | Max count | Mean (µ) | Var (σ2) | VMR (σ/µ) |
|---|---|---|---|---|---|---|
| 1,238–1,846 | 23.1 (20.5–25.6) | 32 | 8 | 1.32 | 2.72 | 2.06 |
| > 1,846–2,022 | 25.8 (23.1–28.5) | 33 | 6 | 1.32 | 2.26 | 1.71 |
| > 2,022–2,115 | 27.4 (24.4–30.3) | 34 | 6 | 1.36 | 2.31 | 1.70 |
| > 2,115–2,945 | 28.5 (26.0–31.1) | 36 | 4 | 1.30 | 1.45 | 1.11 |
*
Data were summed by elevation quartile to week of year for all years for which data were available (1980–2008). Shown are the mean week of onset, number of weeks wherein at least one case was reported, and maximum number of cases ever occurring in a week. The VMRs were calculated to compare the distribution of cases where values near 1 show a Poisson-like distribution and values greater than 1 indicate over-dispersal or temporal clumping of case occurrence.