Table II.
Characteristics of study participants in different strata of districts
| Characteristics | Stratum* | Overall (n=28,000) | |||
|---|---|---|---|---|---|
| Zero (n=6,014) | Low (n=8,822) | Medium (n=6,380) | High (n=6,784) | ||
| Age (yr) | |||||
| 18-45 | 3,234 (53.8) | 4,302 (48.9) | 2,611 (41.1) | 3,405 (50.3) | 13,552 (48.5) |
| 45-60 | 1,844 (30.7) | 3,031 (34.4) | 2,310 (36.4) | 2,340 (34.6) | 9,525 (34.1) |
| >60 | 930 (15.5) | 1,468 (16.7) | 1,431 (22.5) | 1,019 (15.1) | 4,848 (17.4) |
| Missing data | 6 | 21 | 28 | 20 | 75 |
| Mean age±SD | 43.4±15.4 | 45.1±15.0 | 48.3±15.2 | 44.6±14.8 | 45.3±15.2 |
| Sex | |||||
| Male | 2,964 (49.3) | 4,300 (48.9) | 3,209 (50.5) | 3,041 (44.9) | 13,514 (48.4) |
| Female | 3,037 (50.6) | 4,493 (51.0) | 3,140 (49.4) | 3,720 (55.0) | 14,390 (51.5) |
| Others | 7 (0.1) | 9 (0.1) | 5 (0.1) | 6 (0.1) | 27 (0.1) |
| Missing data | 6 | 20 | 26 | 17 | 69 |
| Occupation with high exposure | 1,186 (19.7) | 1,501 (17.1) | 1,142 (18.0) | 1,397 (20.7) | 5,226 (18.7) |
| History of respiratory symptoms in last 30 days | 131 (2.2) | 156 (1.8) | 109 (1.7) | 89 (1.3) | 486 (1.7) |
| Sought medical care for respiratory symptoms | 70 (53.0) | 68 (43.6) | 51 (46.8) | 28 (31.5) | 217 (44.7) |
| History of hospitalization | 24 (34.3) | 24 (35.3) | 15 (29.4) | 4 (14.3) | 67 (30.9) |
| History of contact with COVID-19 case | 88 (1.5) | 46 (0.5) | 6 (0.1) | 11 (0.2) | 151 (0.5) |
| Ever tested for COVID-19 by RT-qPCR | 6 (0.1) | 11 (0.1) | 16 (0.3) | 37 (0.5) | 70 (0.3) |
Values given as n (%) except otherwise stated. *Based on incidence of reported COVID-19 cases as per the ICMR laboratory database. RT-qPCR, real-time reverse transcription-polymerase chain reaction