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| Characteristics | Overall | Infected | Not Infected | |
|---|---|---|---|---|
| Age, mean(s.d.)(years) | 58.61(15.56) | 60.02(14.86) | 55.39(19.66) | |
| Male,No./No.(%) | 138/280(49.29) | 79/195(40.51) | 59/85(69.41) | |
| Temperature, mean(s.d.)(°C) | 37.67(1.05) | 37.82(0.99) | 37.34(1.11) | |
| Symptoms | Fever | 160 | 130 | 30 |
| Cough | 138 | 112 | 26 | |
| Feebleness | 83 | 75 | 8 | |
| Chest distress | 63 | 50 | 13 | |
| Basic diseases | Hypertension | 69 | 55 | 14 |
| Diabetes | 40 | 36 | 4 | |
| Heart disease | 9 | 8 | 1 | |
