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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 2.3 
% Mortality (n)
 
3.2 (8)
 
7.4 (11)
 
4.8 (19)
 
N/A
 
4.9 (7)
 
1.4 (1)
 
3.7 (8)
 


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 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.

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