Table 1.

Demographic characteristics of the investigated groups.

	All participants N = 172	Group A N = 59	Group B N = 56	Group C N = 57	P-value
Age	38.4 ± 10.7	38.0 ± 10.6	38.5 ± 10.0	38.7 ± 11.4	0.936
Gender ratio	1.6 (105 M/67 F)	2.5 (42 M/17 F)	1.2 (31 M/25 F)	1.3 (32 M/25 F)	0.143
Comorbidities, n (%)		14	17	19
Hypertension	7 (4.1%)	0 (0%)	2 (3.6%)	5 (8.8%)	0.056
Diabetes	4 (2.3%)	0 (0%)	1 (1.8%)	3 (5.3%)	0.161
Asthma	2 (1.2%)	0 (0%)	1 (1.8%)	1 (1.8%)	0.589
COPD	1 (0.6%)	0 (0%)	0 (0%)	1 (1.8%)	0.363
History of COVID-19 infection	0	0	0	0	_
Vaccination		Vaccine not yet available

COPD, chronic obstructive pulmonary disease; F, female; M, male; NS, not significant.