Table 3.
Prognostic value for baseline parameters on survival according to the multivariate Cox regression analysis
| Parameter estimate | Standard error | HR | 95% CI | P-value | |
|---|---|---|---|---|---|
| Age (years) | 0.05 | 0.02 | 1.05 | 1.01 to 1.08 | 0.008 |
| BMI (kg/m2) | −0.07 | 0.03 | 0.94 | 0.89 to 0.99 | 0.011 |
| NIV started after ARF | 0.59 | 0.26 | 1.81 | 1.06 to 3.08 | 0.029 |
| HCO3− | 0.06 | 0.03 | 1.06 | 1.00 to 1.12 | 0.049 |
| FEV1 (% predicted) | −0.04 | 0.02 | 0.96 | 0.93 to 0.99 | 0.007 |
| Diuretics | 0.46 | 0.25 | 1.59 | 0.97 to 2.61 | 0.069 |
| Gender | 0.09 | 0.25 | 1.09 | 0.66 to 1.79 | 0.737 |
| OSA | −0.27 | 0.55 | 0.76 | 0.26 to 2.23 | 0.620 |
Notes: Model coefficients: -2 log likelihood 606.568; χ2=38.938; P<0.001; n=166. The values in bold are considered statistically significant (P<0.05).
Abbreviations: ARF, acute respiratory failure; HCO3−, arterial bicarbonate; NIV, noninvasive ventilation; OSA, obstructive sleep apnea.