Table 3

Mortality Predictors Selected by Classification Tree Model

ParameterDied (n = 2675)Survived (n = 62,505)OR of Death (95% CI)
Age (yrs)
 Mean ± SD77.4 ± 12.272.3 ± 14.0
 Median (Q1, Q3)79.6 (71.3, 86.0)74.9 (63.7, 82.5)
 Age >78 vs. ≤781.88 (1.74–2.04)
BUN (mg/dl)
 Mean ± SD47.9 ± 29.731.2 ± 20.5
 Median (Q1, Q3)40.0 (26.0, 61.0)25.0 (17.0, 39.0)
 BUN >42 vs. ≤423.34 (3.08–3.62)
Serum Cr (mg/dl)
 Mean ± SD2.1 ± 1.71.7 ± 1.7
 Median (Q1, Q3)1.7 (1.2, 2.5)1.3 (1.0, 1.8)
 Cr >3.2 vs. ≤3.21.99 (1.78–2.24)
SBP (mm Hg)
 Mean ± SD124.9 ± 29.9145.0 ± 32.4
 Median (Q1, Q3)122 (104, 143)142 (121, 165)
 SBP ≤115 vs. >1153.09 (2.85–3.35)
DBP (mm Hg)
 Mean ± SD67.7 ± 18.578.3 ± 20.1
 Median (Q1, Q3)67 (55, 78)76 (64, 90)
 DBP ≤55 vs. >552.87 (2.62–3.14)
Serum sodium (mmol/l)
 Mean ± SD136.5 ± 6.2138.2 ± 4.8
 Median (Q1, Q3)137 (133, 140)139 (136, 141)
 Sodium ≤134 vs. >1342.26 (2.08–2.47)
HR (beats/min)
 Mean ± SD90.7 ± 23.388.5 ± 21.8
 Median (Q1, Q3)88 (74, 105)86 (73, 101)
 HR >84 vs. ≤841.20 (1.11–1.30)
Dyspnea at rest, n (%)1,220 (46%)21,757 (35%)1.57 (1.45–1.70)

CI = confidence interval; Cr = creatinine; HR = heart rate; OR = odds ratio; other abbreviations as in Table 1.

  • 25th percentile (Q1) and 75th percentile (Q3).