Table I.
Characteristics of study subjects
| All racial groups
|
Caucasians only
|
||||||
|---|---|---|---|---|---|---|---|
| Characteristics | Arizona n = 247 |
Colorado n = 148 |
Combined n = 395 |
Ariz WNV− n = 145 |
Arizona n = 143 |
Colorado n = 72 |
Combined n = 72 |
| Mean age (y) | 53 ± 19 | 50 ± 18 | 52 ± 19 | 45 ± 20 | 57 ± 18 | 50 ± 18 | 54 ± 18 |
| Male sex (%) | 55.6 | 48.6 | 52.8 | 44.3 | 53.8 | 41.7 | 49.8 |
| Caucasian (%) | 57.9 | 48.6 | 54.4 | 13.1 | 100 | 100 | 100 |
| Hispanic (%) | 10.1 | 11.5 | 10.6 | 2.8 | N/A | N/A | N/A |
| Asian/Pacific Islander (%) | 2.0 | 0.0 | 1.3 | 0.7 | N/A | N/A | N/A |
| Native American (%) | 2.4 | 0.0 | 1.5 | 2.1 | N/A | N/A | N/A |
| Black (%) | 0.0 | 0.7 | 0.3 | 0.7 | N/A | N/A | N/A |
| Not specified (%) | 27.5 | 39.2 | 31.9 | 80.7 | N/A | N/A | N/A |
| Fever (%)a | 26.7 | 24.3 | 25.8 | N/A | 34.3 | 22.2 | 30.2 |
| Meningitis (%)a | 25.9 | 39.9 | 31.1 | N/A | 30.8 | 43.1 | 34.9 |
| Encephalitis (%)a | 24.7 | 35.8 | 28.9 | N/A | 31.5 | 34.7 | 32.6 |
| Not specified (%)a | 22.7 | 0.0 | 14.2 | N/A | 3.5 | 0 | 2.3 |
| % Mortality (n) | 3.2 (8) | 7.4 (11) | 4.8 (19) | N/A | 4.9 (7) | 1.4 (1) | 3.7 (8) |
Arizona and Colorado refer to cohorts of patients with symptomatic seropositive WNV infection. Ariz WNV− refers to a second Arizona cohort of symptomatic patients in whom WNV was considered as the diagnosis but ruled out. Data pooled from the WNV+ Arizona and Colorado cohorts are also shown (Combined).
a
Patients were classified into one of the four indicated disease categories by physician interview.
N/A, not available or applicable.