Table 1.

Characteristics of cohort.

No. of subjects	1033
Median age (range)a	58.7 (18–99)
Gender no. (%)
Male	590 (57,1%)
Female	443 (42.9%)
Ethnicity no. (%)
White	998 (96.61%)
Hispanic	21 (2.03%)
Black	4 (0.38%)
Asian	10 (0.96%)
Clinical category no. (%)
Hospitalized intubated (Group 4)	98 (9.5%)
Hospitalized CPAP/BiPAP (Group 3)	190 (18.4%)
Hospitalize oxygen support (Group 2)	326 (31.55%)
Hospitalized w/o oxygen support (Group 1)	153 (14.8%)
Not hospitalized a/paucisymptomatic (Group 0)	266 (25.75%)