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Table 5 Multivariate cox regression analysis for 5-year overall

From: Chemotherapy is not necessary for early-stage serous and endometrioid ovarian cancer after undergoing comprehensive staging surgery

Characteristics HR (95% CI) P-value
Chemotherapy
 No/Unknown Ref  
 Yes 1.092(0.954–1.249) 0.201
Age, years
  ≤ 45 Ref  
 45–65 1.044(0.877–1.244) 0.627
  > 65 1.486 (1.208–1.827) < 0.001
Race
 White Ref  
 Non-white 0.984 (0.810–1.195) 0.872
Stage
 IA Ref  
 IB 0.967 (0.689–1.359) 0.848
 IC 1.063 (0.910–1.241) 0.441
 IIA 1.128 (0.862–1.475) 0.381
Grade
 1 Ref  
 2 0.865 (0.743–1.008) 0.063
Laterality
 Right Ref  
 Left 0.984 (0.852–1.136) 0.824
 Other/Unknown 1.115 (0.862–1.443) 0.407
Tumor size, cm
  ≤ 10 Ref  
  > 10 0.984 (0.848–1.141) 0.830
 Unknown 0.760 (0.630–0.918) 0.004
Histology
 Serous Ref  
 Endometrioid 0.697 (0.584–0.833) < 0.001
  1. P < 0.05 was considered to indicate a statistically significant difference. HR hazard ratios, CI confidence intervals, Ref reference