Differences between patients in various conditions
| Variable | Ordinary (n=182) n (%) | Severe (n=284) n (%) | Critical (n=75) n (%) | P value |
| Male | 75 (41.2) | 135 (47.5) | 45 (60.0) | 0.023 |
| Age | ||||
| Mean (SD) | 49.26±16.13 | 60.35±15.40 | 67.57±13.84 | <0.001 |
| ≤40 | 63 (34.6) | 37 (13.0) | 5 (6.7) | |
| 40–60 | 70 (38.5) | 82 (28.9) | 16 (21.3) | |
| 60–80 | 45 (24.7) | 142 (50.0) | 41 (54.7) | |
| >80 | 4 (2.2) | 23 (8.1) | 13 (17.3) | |
| Respiratory system disease | 12 (6.6) | 20 (7.0) | 13 (17.3) | 0.010 |
| Malignant tumour | 1 (0.5) | 9 (3.2) | 2 (2.7) | 0.149 |
| Endocrine system disease | 13 (7.1) | 38 (13.4) | 11 (14.7) | 0.077 |
| Urinary system disease | 6 (3.3) | 10 (3.5) | 5 (6.7) | 0.402 |
| Cardiovascular diseases | 28 (15.4) | 76 (26.8) | 40 (53.3) | <0.001 |
| Hypertension | 23 (12.6) | 67 (23.6) | 35 (46.7) | <0.001 |
| Coronary heart disease | 5 (2.7) | 22 (7.7) | 14 (18.7) | <0.001 |
| Abnormal heart rhythms | 3 (1.6) | 4 (1.4) | 5 (6.7) | 0.037 |
| Cerebrovascular disease | 0 (0) | 6 (2.1) | 2 (2.7) | 0.070 |
| Leucocytes <3.5×10⁹/L | 16 (8.8) | 33 (11.6) | 5 (6.7) | 0.368 |
| Leucocytes >9.5×10⁹/L | 15 (8.2) | 24 (8.5) | 29 (38.7) | <0.001 |
| Haemoglobin <115.0 g/L | 41 (22.5) | 123 (43.3) | 29 (38.7) | <0.001 |
| Lymphocytes <1.1×10⁹/L | 63 (34.6) | 169 (59.5) | 64 (85.3) | <0.001 |
| C reactive protein >10.0 mg/L | 92 (50.5) | 225 (79.2) | 69 (92.0) | <0.001 |
| Albumin <40.0 g/L | 117 (64.3) | 212 (74.6) | 68 (90.7) | <0.001 |
| Lactate dehydrogenase >250.0 U/L | 54 (29.7) | 165 (58.1) | 64 (85.3) | <0.001 |
| Aspartate aminotransferase >35.0 U/L | 33 (18.1) | 83 (29.2) | 33 (44.0) | <0.001 |
| Alanine aminotransferase >40.0 U/L | 34 (18.7) | 76 (26.8) | 24 (32.0) | 0.042 |
| Serum creatinine >81.0 μmol/L | 10 (5.5) | 31 (10.9) | 23 (30.7) | <0.001 |
| Death | 5 (2.7) | 13 (4.6) | 35 (46.7) | <0.001 |