Parameter Delta Delta Delta Omicron Omicron Omicron
≤5 >5 P ≤5 >5 p
All
n 274 205 231 35
Mortality, % (n) 13.5 (37/274) 7.8 (16/205) >0.05 10.8 (25/231) 14.3 (5/35) >0.05
Need for oxygen therapy, % (n) 73 (200/274) 83.9 (172/205) <0.001 56.7 (131/231) 77.1 (27/35) 0.0218
Time of oxygen therapy, mean ± SD 8.4±9.4 10.1±8.7 >0.05 9.4±7.0 11.2±6.8 >0.05
Need for mechanical ventilation, % (n) 8.8 (24/274) 6.8 (14/205) >0.05 1.7 (4/231) 5.7 (2/231) >0.05
> 60 years
n 172 110 182 29
Mortality, % (n)
20.3 (35/172)
10 (11/110)
>0.05
12.6 (23/ 182)
17.2 (5/29)
>0.05
Need for oxygen therapy, % (n) 79.1 (136/172) 27.3 (30/110) >0.05 63.7 (116/182) 75.9 (22/29) >0.05
Time of oxygen therapy, mean ± SD 9.6±9.9 10.7±9.1 >0.05 9.3±7 10.3±6.7 >0.05
Need for mechanical ventilation, % (n) 9.9 (17/172) 7.3 (8/110) >0.05 1.6(3/182) 0 (0/29) >0.05
> 80 years
n 56 36 75 13
Mortality, % (n) 33.9 (19/56) 16.7 (6/36) >0.05 16 (12/75) 30.8(4/13) >0.05
Need for oxygen therapy, % (n) 89.3 (50/56) 83.3 (30/36) >0.05 62.7(47/75) 84.6(11/13) >0.05
Time of oxygen therapy, mean ± SD 10.1±8.9 10.9±8.1 >0.05 8.4±5.6 11.7±7.4 >0.05
Need for mechanical ventilation, % (n) 8.9 (5/56) 8.3 (3/36) >0.05 1.3 (1/75) 0 (0/13) >0.05