Table 5 Sensitivities, specificities, predictive values, and likelihood ratios for select base excess and hematocrit cutoff levels
Predicting variable | Cutoff level | Sensitivity (95% CI) | Specificity (95% CI) | Positive Predicting Value (95% CI) | Negative Predicting Value (95% CI) | Positive Likelihood Ratio (95% CI) | Negative Likelihood Ratio (95% CI) |
|---|---|---|---|---|---|---|---|
Base excess | −6.56 | 100 (94,100) | 44.83 (26,64) | 79.49 (69,88) | 100 (75,100) | 1.81 (1.31,2.52) | 0 |
−4.56a | 96.77 (89,100) | 79.31 (60,92) | 90.91 (81,97) | 92 (74,99) | 4.68 (2.29,9.55) | 0.0407 (.01,.16) | |
6.56 | 6.45 (2,16) | 100 (88,100) | 100 (40,100) | 33.33 (24,44) | NA | 0.0094 (.88,1.00) | |
Hematocrit | 28 | 98.39 (91,100) | 0 (0, 15) | 67.78 (57,77) | 0 (0,95) | 0.98 (.95,1.02) | NA |
40a | 69.35 (56,80) | 65.52 (46,82) | 81.13 (68,91) | 50.00 (33,67) | 2.01 (1.19,3.41) | 0.47 (0.31,0.70) | |
52 | 1.61 (0,.09) | 96.55 (82,100) | 50.00 (1,99) | 31.46 (22,42) | 0.47 (0.03,7.22) | 1.02 (0.98,1.05) |