Table 4.
Logistic regression model of PIM and PIM2 in the study sample.
| Coefficient (95% CI) in our study | P value | Coefficient (95% CI) in development set | P value | |
|---|---|---|---|---|
| Variables: PIM | ||||
| Pupils fixed to light (yes/no) | 2.38 (1.32, 3.44) | 0.004 | 2.35 (1.87, 2.84) | <0.00005 |
| Specified diagnosis (yes/no) | 0.73 (0.04, 1.42) | 0.037 | 1.82 (1.45, 2.2) | <0.00005 |
| Elective admission (yes/no) | −0.67 (−1.74, 0.39) | 0.21 | −1.55 (−1.94, −1.16) | <0.00005 |
| Mechanical ventilation (yes/no) | 1.72 (1.24, 2.19) | <0.001 | 1.34 (0.95, 1.72) | <0.00005 |
| Absolute (SBP-120) mm Hg | 0.19 (0.006, 0.33) | 0.004 | 0.021 (0.014, 0.027) | <0.00005 |
| Absolute base excess (mmol/l) | 0.004 (0.03, 0.04) | 0.845 | 0.071 (0.046, 0.095) | <0.00005 |
| 100× FiO2/PaO2 (mm Hg−1) | 0.89 (0.28, 1.49) | 0.004 | 0.41 (0.23, 0.59) | <0.00005 |
| Constant | −2.48 (−3.01, −1.9) | −4.873 (−5.25, −4.49) | ||
| Variables: PIM 2 | ||||
| Pupils fixed to light (yes/no) | 2.67 (1.51, 3.8) | 0.008 | 3.07 (2.77, 3.38) | <0.0005 |
| Elective admission (yes/no) | Omitted | — | −0.92 (−1.17, −0.6) | <0.0005 |
| Mechanical ventilation (yes/no) | 1.89 (1.41, 2.37) | <0.001 | 1.37 (1.08, 1.65) | <0.0005 |
| Absolute (SBP-120) mm Hg | 0.01 (0.005, 0.03) | 0.008 | 0.01 (0.013, 0.017) | <0.0005 |
| Absolute (base excess) mmol/l | 0.006 (0.03, 0.04) | 0.77 | 0.10 (0.09, 0.11) | <0.0005 |
| 100× FiO2/PaO2 (mm Hg−1) | 0.97 (0.34, 1.6) | 0.002 | 0.28 (0.20, 0.37) | <0.0005 |
| Recovery post procedure (yes/no) | 0.98 (−2.1, 0.1) | 0.09 | −0.93 (−1.2, −0.6) | <0.0005 |
| By pass (yes/no) | Omitted | 0.75 (0.39, 1.10) | <0.0005 | |
| High risk diagnosis (yes/no) | 0.78 (0.10, 1.4) | 0.023 | 1.68 (1.5, 1.8) | <0.0005 |
| Low risk diagnosis (yes/no) | −0.99 (−2.2, 0.29) | 0.13 | −1.57 (−2.02, −1.12) | <0.0005 |
| Constant | −2.55 (−3.1, −1.9) | −4.88 (−5.11, −4.6) |
SBP: systolic blood pressure; FiO2: fraction of inspired oxygen; PaO2: partial pressure of oxygen; PIM: Pediatric Index of Mortality; CI: confidence interval.