Table 4.
Characteristics of the variables that were used as input features to our models. The mean and interquartile ranges are shown for the demographic features, and vital-sign measurements. For the comorbidities and symptoms admission, n denotes the number of patients and % denotes the percentage of patients per the respective dataset.
| Variable, unit | Training set A | Test set A | Training set B | Test set B |
|---|---|---|---|---|
|
Demographics, mean (IQR) | ||||
| Age | 41.7 (17.0) | 45.5 (18.0) | 39.3 (17.0) | 42.7 (20.0) |
| BMI | 26.9 (5.2) | 26.7 (5.7) | 26.5 (5.7) | 27.9 (6.2) |
| Male, n (%) |
1582 (86.5) |
522 (88.9) |
622 (87.5) |
191 (84.8) |
|
Comorbidities, n (%) | ||||
| Hypertension | 550 (30.1) | 213 (36.3) | 168 (23.6) | 71 (31.6) |
| Diabetes | 427 (23.3) | 221 (37.6) | 121 (17.0) | 73 (32.4) |
| Chronic kidney disease | 68 (3.7) | 30 (5.1) | 20 (2.8) | 7 (3.1) |
| Cancer |
30 (1.6) |
7 (1.2) |
12 (1.7) |
8 (3.6) |
|
Symptoms at admission, n (%) | ||||
| Cough | 851 (46.5) | 338 (57.6) | 259 (36.4) | 99 (44.0) |
| Fever | 28 (1.5) | 20 (3.4) | 3 (0.4) | 3 (1.3) |
| Shortness of breath | 190 (10.4) | 99 (16.9) | 71 (10.0) | 34 (15.1) |
| Sore throat | 238 (13.0) | 89 (15.2) | 118 (16.6) | 28 (12.4) |
| Rash |
29 (1.6) |
10 (1.7) |
15 (2.1) |
5 (2.2) |
|
Vital-sign measurements, mean (IQR) | ||||
| Systolic blood pressure, mmHg | 126.3 (15.0) | 126.8 (16.0) | 128.8 (15.5) | 128.2 (15.7) |
| Diastolic blood pressure, mmHg | 77.5 (9.8) | 76.9 (9.9) | 77.9 (10.3) | 77.5 (10.7) |
| Respiratory rate, breaths per minute | 18.9 (1.0) | 20.2 (2.5) | 18.1 (0.7) | 18.7 (0.8) |
| Peripheral pulse rate, beats per minute | 82.6 (11.5) | 85.4 (11.6) | 81.7 (13.4) | 82.5 (12.5) |
| Oxygen saturation, % | 98.4 (1.6) | 97.5 (2.1) | 98.5 (1.0) | 98.2 (1.4) |
| Temperature auxiliary, °C | 36.9 (0.4) | 37.0 (0.7) | 36.9 (0.4) | 37.1 (0.6) |
| Glasgow Coma Score | 14.8 (0.0) | 15.0 (0.0) | 14.8 (0.0) | 14.8 (0.0) |