TABLE 1.
Demographic data in adults asymptomatic or symptomatic of respiratory tract infectiona
| Characteristicsb | Asymptomatic subjects (n = 444) | Symptomatic reference subjects (n = 103) | P valuec |
|---|---|---|---|
| Age (median [IQR]) (yr) | 66 (57–76) | 69 (54–77) | 0.7 |
| Female sex | 242 (55) | 65 (63) | 0.1 |
| Current smoker | 55 (12) | 21 (20) | 0.03 |
| Chronic lung disease | 66 (15) | 30 (29) | 0.0006 |
| Asthma | 39 (9) | 18 (18) | 0.009 |
| COPD | 20 (5) | 12 (12) | 0.005 |
| Lung cancer | 3 (1) | 1 (1) | 1 |
| Other lung disease | 10 (2) | 7 (7) | 0.03 |
| Any chronic medical conditiond | 286 (64) | 62 (60) | 0.4 |
| Chronic heart disease | 101 (23) | 25 (24) | 0.7 |
| Diabetes mellitus | 96 (22) | 11 (11) | 0.01 |
| Chronic kidney disease | 14 (3) | 1 (1) | 0.3 |
| Chronic liver disease | 4 (1) | 0 | 0.6 |
| Malignancy | 21 (5) | 11 (11) | 0.02 |
| IBD | 12 (3) | 4 (4) | 0.5 |
| Rheumatic disease | 33 (7) | 8 (8) | 0.9 |
| Immunodeficiency | 29 (7) | 6 (6) | 0.8 |
| Other chronic disease | 62 (14) | 9 (9) | 0.2 |
| Children at home | 57 (13) | 6 (6) | 0.04 |
| Children at daycare | 16 (4) | 3 (3) | 1 |
| Influenza vaccination | 166 (37) | 34 (33) | 0.4 |
| Pneumococcal vaccination | 30 (7) | 7 (7) | 1 |
| Antibiotics in last 14 days | 50 (49) | ||
| Duration of symptoms (>7 days) | 30 (29) | ||
| Included at hospital | 97 (22) | 58 (56) | <0.0001 |
| Included at primary health care | 347 (78) | 45 (44) | <0.0001 |
a
Data presented as number (%), unless otherwise specified.
b
IQR, interquartile range; IBD, inflammatory bowel disease.
c
Pearson chi-square (or Fisher’s exact test when appropriate). For age, the Mann-Whitney test was used.
d
Includes asthma, COPD, lung cancer, and other lung disease.