| Factor | Response | Cases n = 51 (%) | Controls n = 102 (%) | Odds Ratio (95% CI) | p value | Adjusted OR (95% CI) | p value |
| Gender | Female | 28 (54.9) | 71 (69.6) | 0.53 (0.26 - 1.06) | 0.07 | 0.88 (0.43 - 2.66) | 0.89 |
| Male | 23 (45.1) | 31 (30.4) |
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| Age | 18 - 24 | 2 (3.9) | 15 (14.7) | Ref |
| Ref | Ref |
| 25 - 34 | 5 (9.8) | 36 (35.3) | 1.04 (0.18 - 5.98) | 0.96 | 0.79 (0.12 - 4.91) | 0.79 | |
| 35 - 44 | 16 (31.4) | 23 (22.6) | 5.22 (1.05 - 26.04) | 0.03 | 4.46 (0.83 - 23.36) | 0.08 | |
| 45 - 54 | 14 (27.5) | 19 (18.6) | 5.53 (1.08 - 28.18) | 0.03 | 3.35 (0.51 - 22.06) | 0.21 | |
| 55 - 64 | 7 (13.7) | 2 (1.9) | 26.25 (3.04 - 226.61) | 0.00 | 12.22 (1.15 - 129.8) | 0.04 | |
| 65+ | 7 (13.7) | 7 (6.9) | 7.5 (1.22 - 45.81) | 0.02 | 4.89 (0.61 - 39.44) | 0.14 | |
| Occupation | Health worker | 20 (39.2) | 26 (25.5) | Ref |
| Ref |
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| Teacher | 9 (17.8) | 9 (8.8) | 1.3 (0.44 - 3.88) | 0.64 | 2.26 (0.60 - 8.58) | 0.23 | |
| Student | 1 (2.0) | 18 (17.7) | 0.07 (0.01 - 0.59) | 0.00 | 0.07 (0.00 - 1.22) | 0.07 | |
| Unemployed | 8 (15.7) | 27 (26.4) | 0.39 (014 - 1.03) | 0.05 | 0.26 (0.07 - 0.93) | 0.04 | |
| Other | 13 (25.5) | 22 (21.6) | 0.77 (0.31 - 1.91) | 0.57 | 0.77 (0.26 - 2.29) | 0.64 | |
| History of COVID-19 | Yes | 3 (5.9) | 10 (9.8) | 0.58 (0.15 - 2.19) | 0.41 | * * * |
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| No | 48 (94.1) | 92 (90.2) |
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| Chronic illnesses | Yes | 30 (58.8) | 34 (33.3) | 2.86 (1.42 - 5.71) | 0.00 | 1.15 (0.40 - 3.29) | 0.79 |
| No | 21 (41.2) | 68 (66.7) |
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| History of hypertension | Yes | 27 (52.9) | 26 (25.5) | 3.29 (1.62 - 6.67) | 0.00 | 1.21 (0.30 - 4.86) | 0.62 |
| No | 24 (47.1) | 76 (74.5) |
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| Vaccine | Sinopharm | 27 (52.9) | 47 (46.1) | 1.32 (0.67 - 2.58) | 0.42 | * * * |
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| Sinovac | 24 (47.1) | 55 (53.9) |
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| Contact with a COVID-19 patient | Yes | 37 (75.6) | 62 (60.8) | 1.70 (0.82 - 3.55) | 0.15 | 1.24 (0.51 - 3.01) | 0.61 |
| No | 14 (27.4) | 40 (39.2) |
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| Smoking | Yes | 11 (21.6) | 8 (7.8) | 3.23 (1.21 - 8.64) | 0.02 | 3.07 (0.86 - 11.00) | 0.08 |
| No | 40 (78.4) | 94 (92.2) |
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| History of TB | Yes | 11 (21.6) | 6 (5.9) | 4.40 (1.52 - 12.71) | 0.00 | 2.81 (0.73 - 10.77) | 0.13 |
| No | 40 (78.4) | 96 (94.1) |
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| HIV status | Negative | 41 (80.4) | 86 (84.3) | 0.76 (0.32 - 1.83) | 0.54 | * * * |
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| Positive | 10 (19.6) | 16 (15.7) |
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| Hand washing adherence | Always | 28 (54.9) | 75 (73.5) | 0.44 (0.22 - 0.89) | 0.02 | 2.24 (0.64 - 7.82) | 0.21 |
| Sometimes | 23 (45.1) | 27 (26.5) |
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| Mask wearing adherence | Always | 29 (56.9) | 74 (72.6) | 0.50 (0.25 - 1.00) | 0.05 | 1.60 (0.51 - 5.03) | 0.43 |
| Sometimes | 22 (49.1) | 28 (27.4) |
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| Social distancing adherence | Always | 26 (51.0) | 69 (67.7) | 0.50 (0.25 - 0.99) | 0.04 | 0.84 (0.21 - 3.42) | 0.81 |
| Sometimes | 25 (49.0) | 33 (32.3) |
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