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. 2021 Nov 23;16(11):e0260261. doi: 10.1371/journal.pone.0260261

Table 1. Characteristics of 951 enrolled healthcare workers.

Age, years Median IQR
35 (29–42)
Sex N %
Male 167 (17.6%)
Female 784 (82.4%)
Role N %
Clinical roles 545 (57.3%)
 Nursing and midwifery 404 (42.5%)
 Allied health professionals 65 (6.8%)
 Medical 45 (4.7%)
 Dental 31 (3.3%)
Non-clinical roles 406 (42.7%)
 Cleaning/domestic services 203 (21.3%)
 Security/maintenance/porters/drivers 104 (10.9%)
 Administrative 71 (7.5%)
 Laboratory 15 (1.6%)
 Other 13 (1.4%)
Highest level of education N %
Did not complete primary 2 (0.2%)
Primary 6 (0.6%)
Secondary O-Level 407 (42.8%)
Secondary A-Level 114 (12.0%)
Diploma after secondary 280 (29.4%)
University 142 (14.9%)
Medical insurance N %
Medical insurance 598 (62.9%)
No medical insurance 353 (37.1%)
Medical history 1 N %
No medical conditions 733 (77.1%)
Hypertension 122 (12.8%)
HIV 70 (7.4%)
Diabetes 19 (2.0%)
Asthma/COPD 17 (1.8%)
Gastritis/peptic ulcer disease 5 (0.5%)
Cardiovascular disease 3 (0.3%)
Epilepsy 2 (0.2%)
Other2 4 (0.4%)

IQR: Interquartile range. COPD: Chronic Obstructive Pulmonary Disease.

1No participants reported a history of: renal disease, previous tuberculosis, malignancy or psychiatric problems.

2Anaemia (1), hayfever (1), hearing loss (1), migraines (1).