Table 6. Significant univariate and multivariate weighted logistic regression analyses for the prediction of 30-day mortality.
| Variable | Univariate | Multivariate * | ||||
|---|---|---|---|---|---|---|
| OR | 95% CI | p-value | OR | 95% CI | p-value | |
| Age (+10 yrs.) | 1·35 | 1·17 to 1·54 | <0·001 | - | - | - |
| Tobacco consumption | - | - | - | |||
| No | 1 | - | - | - | - | - |
| Former | 0·76 | 0·50 to 1·15 | 0·19 | - | - | - |
| Current | 0·48 | 0·28 to 0·81 | 0·006 | - | - | - |
| Alcohol abuse | ||||||
| No | 1 | - | - | - | - | - |
| Former | 0·29 | 0·09 to 0·97 | 0·044 | - | - | - |
| Current | 0·74 | 0·45 to 1·24 | 0·25 | - | - | - |
| APACHE-II at admission | 1·05 | 1·01 to 1·10 | 0·028 | - | - | - |
| Chronic cardiovascular disease | 1·77 | 1·17 to 2·66 | 0·006 | - | - | - |
| Chronic liver disease | 1·93 | 0·96 to 3·87 | 0·061 | - | - | - |
| Chronic neurologic disease | 2·77 | 1·86 to 4·13 | <0·001 | - | - | - |
| Mental confusion | 1·62 | 1·12 to 2·35 | 0·011 | - | - | - |
| Shock | 1·74 | 1·18 to 2·55 | 0·005 | 3·40 | 1·38 to 8·36 | 0·008 |
| PSI risk classes IV-V | 3·05 | 1·59 to 5·86 | <0·001 | - | - | - |
| CURB-65 score 3–5 | 1·86 | 1·25 to 2·77 | 0·002 | - | - | - |
| Serum Creatinine (+1 mg/dL) | 1·21 | 1·03–1·43 | 0·023 | - | - | - |
| Platelets (+100 x 109 cell/L) | 1·22 | 1·02 to 1·47 | 0·034 | - | - | - |
| PaO2/FiO2 (+10 mmHg) | 0.97 | 0.95 to 1.00 | 0.079 | 0·92 | 0·86 to 0·98 | 0·011 |
| Serum Na+ (+1 mEq/L) | 1·03 | 1·00 to 1·06 | 0·044 | - | - | - |
| Serum K+ (+1 mEq/L) | 1·36 | 1·07–1·73 | 0·012 | 2·54 | 1·32 to 4·90 | 0·005 |
| Arterial pH (+0.1 units) | 0·78 | 0·66 to 0·93 | 0·006 | |||
| Invasive mechanical ventilation | 2·18 | 1·44–3·31 | <0·001 | 3·54 | 1·45 to 8·67 | 0·006 |
* Summary statistics of the multivariate model: Pearson chi-square test, value / df = 0·93; AIC value = 144·51.
AIC = Akaike's information criterion; APACHE = acute physiology and chronic health evaluation; CI = confidence interval; CURB-65 = confusion, elevated blood urea nitrogen, respiratory rate and blood pressure plus age ≥65 years; df = degrees of freedom; OR = odds ratio; PSI = pneumonia severity index.