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Table 3 Summary of univariate analyses of overall survival

From: Stereotactic body radiotherapy for very elderly patients (age, greater than or equal to 85 years) with stage I non-small cell lung cancer

Parameters n Hazard ratio (95% CI) p value
Age   1.05 (0.98–1.12) 0.19*
Gender    
 Female 17 1 0.72
 Male 64 1.21 (0.52–3.65)  
PS (ECOG)    
 0 55 1 0.61
 1–2 26 1.23 (0.42–3.65)  
T stage    
 T1a 42 1  
 T1b, T2a 39 2.38 (1.05–5.39) 0.04*
CTV   1.01 (1.00–1.03) 0.05*
PTV   1.00 (0.99–1.01) 0.29
Histology    0.78
 Adenocarcinoma 35 1  
 Squamous cell carcinoma 27 1.46 (0.47–4.57) 0.51
 Unproven 17 1.18 (0.35–3.92) 0.79
Tumor location    
 Peripheral 6 1  
 Central 75 1.29 (0.30–5.51) 0.73
Operability    
 Yes 21 1  
 No 60 1.03 (0.43–2.43) 0.94
Total dose    
 48 Gy 60 1  
 60 Gy 21 0.99 (0.93–1.07) 0.87
  1. Abbreviations: ECOG Eastern Cooperative Oncology Group, CI confidence interval.
  2. *p < 0.2.