Skip to main content
. 2021 Oct 15;16(10):e0258820. doi: 10.1371/journal.pone.0258820

Table 2. Factors associated with breakthrough infection (Cox regression model).

Hazards ratio (95% confidence interval) P-value
Age (per 10 years increase) 1.02 (0.61–1.68) 0.96
Gender (comparator: female sex) 1.26 (0.51–3.16) 0.62
Nationality (comparator: non-Qatari) 2.49 (0.44–14.00) 0.30
Job family (comparator: Nursing and Midwifery)
    Allied Health Professionals 2.99 (0.94–9.50) 0.06
    Clinical Support Services 9.15 (1.32–63.64) 0.03
    Administration 4.10 (1.13–14.90) 0.03
    Physicians 6.27 (1.20–32.82) 0.03
    Non-clinical Support Services 4.95 (1.00–23.45) 0.04
Body mass index <30 kg/m2 (comparator: ≥30) 2.99 (1.20–7.48) 0.02
Current smoker (comparator: never/ former smoker) 2.47 (0.69–8.90) 0.17
Number of comorbidities (comparator: None)
    1–2 1.48 (0.59–3.75) 0.41
    3 or more 0.28 (0.02–4.11) 0.35
Contact with confirmed case (comparator: not exposed) 9.25 (3.67–23.28) <0.0001
Accommodation status (comparator: Single/Family accommodation) 4.34 (0.74–25.46) 0.10
Symptomatic at baseline (comparator: None)
    1–2 30.28 (10.19–90.00) <0.0001
    ≥ 3 112.58 (28.82–439.82) <0.0001