Table 4.
Exposure and clinical characteristics of enrolled health care workers in the baseline screening (n = 4040)
| Total | Infected | P-value a | Unadjusted odds ratio (95% CI) b | Proportion of infection | |
|---|---|---|---|---|---|
| n = 4040 | n = 170 | Overall = 4.2 (3.6-4.9) | |||
| n (column %) | n (column %) | row % (95% CI) | |||
| Contact with a suspected case, yes | 1496 (37.0) | 78 (45.9) | 0.0151 | 1.47 (1.08-2.00) | 5.2 (4.1-6.5) |
| Contact with a confirmed case, yes | 1098 (27.2) | 68 (40.0) | 0.0002 | 1.84 (1.34-2.52) | 6.2 (4.8-7.8) |
| Direct care for a confirmed case in ASU hospital/centre, yes | 459 (11.4) | 22 (12.9) | 0.5076 | 1.17 (0.74-1.85) | 4.8 (3.0-7.2) |
| Face-to-face interaction within 2 m with a confirmed case in ASU hospital/centre, yes | 772 (19.1) | 47 (27.6) | 0.0042 | 1.66 (1.17-2.34) | 6.1 (4.5-8.0) |
| Duration of contact with a confirmed case in ASU hospital/centre | n = 772 | n = 47 | |||
| Less than 5 min | 183 (23.7) | 10 (21.3) | Ref | 5.5 (2.7 -9.8) | |
| 5-15 min | 229 (29.7) | 9 (19.1) | 0.4626 | 0.71 (0.28-1.78) | 3.9 (1.8-7.3) |
| More than 15 min | 360 (46.6) | 28 (59.6) | 0.3203 | 1.46 (0.69-3.07) | 7.8 (5.2-11.0) |
| Symptoms during the past 14 days | |||||
| No | 3424 (84.8) | 116 (68.2) | <0.0001 | Ref | 3.4 (2.8-4.0) |
| Yes | 616 (15.2) | 54 (31.8) | 2.74 (1.96-3.83) | 8.8 (6.7-11.3) | |
| Symptoms severity | n = 616 | n = 54 | |||
| Mild | 408 (66.2) | 21 (38.9) | Ref | 3.4 (2.8-4.0) | |
| Moderate | 180 (29.2) | 26 (48.1) | 0.0002 | 3.11 (1.70-5.70) | 5.1 (3.2-7.8) |
| Severe | 28 (4.5) | 7 (13.0) | 0.0002 | 6.14 (2.35-16.07) | 14.4 (9.7-20.4) |
a
P-values indicate differences between infected and non-infected HCWs.
b
Odds ratio (95% CI) were calculated using binary logistic regression.