title: A comparison between Cox proportional hazard models and logistic regression on prognostic factors in gastric cancer.
abstract: BACKGROUND
  Despite its decreasing prevalence in industrialized nations, gastric cancer remains one of the most frequent cancers in the world. Since stomach cancer often was not detected until an advanced state, survival rate was rather low.
  
  
  OBJECTIVE
  The aim of the present study is to compare the Cox proportional hazard model and Logistic regression model to estimate prognostic of patients with gastric cancer.
  
  
  METHODS
  To determine the independent prognostic factors reducing survival time for gastric cancer, we compared the parametric methods (logistic regression) and non-parametric methods (Cox proportional hazard models) applied to patients who registered in one cancer registry center located in southern Iran.
  
  
  RESULTS
  Of 442, 266 (60.2 %) died. In multivariate analyses using the Cox proportional hazard model, Age at diagnosis (P = 0.018, Hazard rate = 1.84), grade of tumor (P = 0.018, Hazard rate = 1.56), and metastasis (P = 0.004, Hazard rate = 1.53) were the most independent prognostic factors. As well as, using the stepwise logistic regression model, Age at diagnosis, (P = 0.005, Odds Ratio = 1.01), grade of tumor (P = 0.025, OR = 1.95), and metastasis (P < 0.001, OR = 2.81) were also the most independent factors who affected on survival.
  
  
  CONCLUSIONS
  Although regression coefficients are not all the same, these three factors are the most prognostic factors that affect on survival of gastric patients in both multivariate analyses.
authors.affiliation: Research Center for Gastroenterology and Liver Diseases, Shaheed Beheshti University (M.C), Tehran, Iran. b_moghimi_de@yahoo.com
authors.forename: B
authors.initials: B
authors.lastname: Moghimi-Dehkordi
authors.forename: A
authors.initials: A
authors.lastname: Safaee
authors.forename: S Z
authors.initials: SZ
authors.lastname: Tabei
mesh_terms: D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016016:Proportional Hazards Models; D012042:Registries; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000401:mortality*; D016019:Survival Analysis; D013997:Time Factors