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Table 2 Kaplan-Meier survival curve estimates for analysis of prognostic factors for survival

From: Preoperative palsy score has no significant association with survival in non-small-cell lung cancer patients with spinal metastases who undergo spinal surgery

Variables Number of patients Median survival (month) p valuea
(95 % CI)
Age, year    0.010*
 ≤54 16 9.5 (3.22–11.07)  
 55–74 24 8.7 (3.09–13.14)  
 ≥75 10 3.7 (2.0–5.52)  
Sex    0.220
 M 34 6.3 (3.09–9.13)  
 F 16 11.1 (5.52–13.86)  
Tumor histology    0.003*
 Adenocarcinoma 32 9.9 (7.43–11.20)  
 Non-adenocarcinoma 18 3.5 (2.20–5.39)  
Pre-op palsy score    0.870
 0 (Frankel 1, 2) 8 2.5 (1.22–16.03)  
 1 (Frankel 3, 4) 42 8.0 (5.52–9.89)  
Post-op palsy score    <0.001*
 0 (Frankel 1, 2) 2 2.4 (2.4–2.4)b  
 1 (Frankel 3, 4) 32 5.5 (2.92–7.33)  
 2 (Frankel 5) 16 14.3 (9.23–17.02)  
Pre-op PS    <0.001*
 Poor (0, PS 10–40 %) 8 2.4 (0.46–3.78)  
 Moderate (1, PS 50–70 %) 20 3.7 (2.4–6.3)  
 Good (2, PS 80–100 %) 22 13.1 (9.23–16.03)  
BMI    0.540
 Underweight (1) 5 6.3 (0.59–12.02)  
 Eutrophic (2) 31 6.0 (3.18–8.91)  
 Overweight/obese (3) 14 9.1 (7.62–10.65)  
Number of vertebra involved   0.630
 <3 24 6.3 (3.15–9.46)  
 ≥3 26 9.1 (3.16–15.11)  
Other bone metastasis    0.818
 Without 20 5.4 (1.25–9.46)  
 With 30 8.7 (6.56–10.85)  
Visceral metastasis    0.567
 Without 40 8.0 (5.53–10.51)  
 With 10 3.2 (0–7.65)  
  1. *Significant at p value <0.05
  2. a p value is calculated based on log-rank test over all stratification and takes the effect of age into consideration
  3. bThe 95 % CI may be problematic due to too few data values
  4. PS performance status, CI confidence interval, BMI body mass index