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Table 3 Characteristics of the hospital stay for cases and controls of the COVID-19 outbreak

From: Patient and ward related risk factors in a multi-ward nosocomial outbreak of COVID-19: Outbreak investigation and matched case–control study

Variables

Nosocomial COVID-19 No. (%)

Matched control No. (%)

IRR (95%CI)

P value

Percent of exposure on single room

 0–50% of time

36 (92.3%)

55 (78.6%)

Reference

 

 > 50% of time

3 (7.7%)

15 (21.43%)

0.37 (0.15–0.92)

0.031

Percent of exposure on double room

 0–50% of time

26 (66.7%)

46 (65.7%)

Reference

 

 > 50% of time

12 (33.3%)

24 (34.3%)

0.76 (0.44–1.30)

0.310

Percent of exposure on multi-bedded room

 0–50% of time

20 (51.2%)

45 (64.3%)

Reference

 

 > 50% of time

19 (48.7%)

25 (35.7%)

1.86 (1.17–2.94)

0.008

Days in single room (two-day intervals)

 ≥ 0, ≤ 2

35 (89.7%)

57 (81.4%)

Reference

 

 > 2, ≤ 4

2 (5.1%)

9 (12.9%)

0.44 (0.15–1.31)

0.140

 > 4, ≤ 7

2 (5.1%)

4 (5.7%)

0.82 (0.29–2.31)

0.709

Days in double room (two-day intervals)

 ≥ 0, ≤ 2

28 (71.8%)

46 (65.7%)

Reference

 

 > 2, ≤ 4

1 (2.6%)

11 (15.7%)

0.17 (0.02–1.15)

0.069

 > 4, ≤ 7

10 (25.6%)

13 (18.6%)

0.74 (0.41–1.31)

0.300

Days in multi-bedded room (two-day intervals)

 ≥ 0, ≤ 2

18 (46.2%)

50 (71.4%)

Reference

 

 > 2, ≤ 4

5 (12.8%)

11 (15.7%)

1.15 (0.58–2.30)

0.686

 > 4, ≤ 7

16 (41.0%)

9 (12.9%)

3.89 (2.28–6.65)

0.000

  1. CI confidence interval, IQR interquartile range, IRR incidence rate ratio, SD standard deviation