Variables Primary viral pneumonia Pneumonia mixed with bacteria p value
No. of patients 303 326
Median age (IQR), years 84 (81–86) 84 (81-87) 0.8413
No. of males/females 151 / 152 168/158 0.6903
No. (%) of patients with Omicron subvariants
BA.1 112 (37.0) 118 (36.2) 0.8686
BA.2 70 (23.1) 72 (22.1) 0.7753
BA.5 121 (39.9) 136 (41.7) 0.6851
No. (%) of patients with comorbid illnesses
Diabetes mellitus 82 (27.1) 92 (28.2) 0.7892
Chronic lung disease 72 (23.8) 66 (20.2) 0.2909
Chronic heart disease 62 (20.5) 70 (21.5) 0.7697
Cerebrovascular disease 40 (13.2) 71 (21.8) 0.0063
Chronic renal disease 38 (12.5) 23 (18.5) 0.0220
Neoplastic disease 30 (9.9) 42 (12.9) 0.2608
Autoimmune disease 25 (8.3) 16 (4.9) 0.1061
Chronic liver disease 10 (3.3) 19 (5.8) 0.1821
No. (%) of patients with COVID-19 mRNA vaccination
Never 52 (17.2) 55 (16.9) >0.9999
One vaccination 1 (0.3) 0 0.4817
Two vaccinations 149 (49.2) 166 (50.9) 0.6902
Three vaccinations 101 (33.3) 105 (32.2) 0.7989
No. (%) of patients with deterioration of physical activity
At hospital discharge 122 (40.3) 171 (52.5) 0.0024
At 1 year after hospital discharge
62 (20.5)
139 (42.6)
<0.0001
Barthel index (average)
Before admission to hospitals 61 61 >0.9999
At hospital discharge 32 16 <0.0001
At 1 year after hospital discharge
49
27
<0.0001
No. (%) of patients with in-hospital mortality 28 (9.2) 53 (16.3) 0.0089