Calculation of the COVID-NoLab and COVID-SimpleLab Risk Scores and Their Classification Accuracy in Derivation and Validation Groups
| Derivation Group | Validation Group | |||||
|---|---|---|---|---|---|---|
| COVID-NoLab Score | Mortality | Mortality | ||||
| Clinical Predictor | Points | Risk Group | n/Total (%) | SSLR | n/Total (%) | SSLR |
| Age | Low (0 to 1) | 3/167 (1.8%) | 0.10 | 1/129 (0.8%) | 0.06 | |
| 50 to 65 years | 3 | Moderate (2 to 5) | 74/543 (13.6%) | 0.89 | 40/350 (11.4%) | 0.95 |
| > 65 years | 5 | High (6+) | 44/96 (45.8%) | 4.79 | 23/57 (40.4%) | 4.99 |
| Respiratory rate ≥ 30 | 3 | |||||
| O2 saturation < 93% | 2 | |||||
| Derivation Group | Validation Group | |||||
|---|---|---|---|---|---|---|
| COVID-SimpleLab Score | Mortality | Mortality | ||||
| Clinical Predictor | Points | Risk Group | n/Total (%) | SSLR | n/Total (%) | SSLR |
| C-reactive protein > 10 mg/dL | 5 | Low (0 to 7) | 0/129 (0.0%) | 0.0 | 1/97 (1.0%) | 0.07 |
| Respiratory rate ≥ 30 | 5 | Moderate (8 to 11) | 10/131 (8.3%) | 0.46 | 9/99 (9.1%) | 0.66 |
| O2 saturation < 93% | 4 | High (12+) | 58/185 (45.7%) | 2.53 | 29/99 (29.3%) | 2.73 |
| Age | ||||||
| 50 to 65 years | 6 | |||||
| > 65 years | 8 | |||||
| Asthma | 4 | |||||
| White blood cell count > 10 × 109/mL | 3 | |||||
| Serum creatinine > 2.0 mg/dL | 4 | |||||
SSLR, stratum specific likelihood ratio.