Table 6.

Performance of Random Forest Predictors at the optimal operating point.

Model	Sensitivity	Specificity	PPV	NPV
ICU (w. lab markers)	0.73 (0.63, 0.83)	0.74 (0.67, 0.81)	0.60 (0.50, 0.70)	0.84 (0.77, 0.90)
ICU (no lab markers)	0.64 (0.53, 0.74)	0.64 (0.56, 0.72)	0.48 (0.39, 0.58)	0.77 (0.69, 0.84)
ICU (five features)	0.70 (0.60, 0.81)	0.70 (0.63, 0.78)	0.56 (0.46, 0.66)	0.82 (0.75, 0.88)
Ventilation (w. lab markers)	0.72 (0.60, 0.85)	0.73 (0.67, 0.80)	0.44 (0.33, 0.55)	0.90 (0.85, 0.95)
Ventilation (no lab markers)	0.60 (0.46, 0.74)	0.61 (0.53, 0.68)	0.30 (0.21, 0.39)	0.84 (0.77, 0.91)
Ventilation (five features)	0.74 (0.62, 0.87)	0.75 (0.68, 0.81)	0.45 (0.34, 0.57)	0.91 (0.86, 0.96)

We report Sensitivity, Specificity, Positive Predictive Value (PPV), and Negative Predictive Value (NPV). Numbers in parenthesis are the 95% confidence interval.