title: [The application of Weibull parameter model to survival analysis of glioma].
abstract: OBJECTIVE
  To investigate the factors affecting the survival and to predict the survival time of glioma.
  
  
  METHODS
  Graph method was applied to fit the type of probability distribution of patients' postoperative survival time. As one suitable model, Weibull regression model tested by residual analysis was used to identify prognostic factors for postoperative survival and to predict patients' post-operative survival time.
  
  
  RESULTS
  In multivariate analysis of Weibull regression model, following characteristics showed significant influence on postoperative survival time including: sex, age, epilepsy, type of glioma, density of glioma, type of surgery, times of surgery and mode of postoperative therapy. According to predictive value, patients were clustered into three groups. The survival probability of one year for the first group was less than 50% and that of five years for the second group about 50%, for the third group around 80%.
  
  
  CONCLUSIONS
  Sex, age, epilepsy, type of glioma, density of glioma, type of surgery, times of surgery and mode of postoperative therapy were important risk factors and Weibull regression model might help to predict patients' postoperative survival time.
authors.affiliation: Second Hospital of Shandong University, Jinan 250033, China.
authors.forename: Hong-ying
authors.initials: HY
authors.lastname: Jia
authors.forename: Jie-zhen
authors.initials: JZ
authors.lastname: Wang
authors.forename: Jing-jie
authors.initials: JJ
authors.lastname: Zhao
mesh_terms: D001932:Brain Neoplasms / Q000453:epidemiology / Q000401:mortality* / Q000601:surgery; D002681:China / Q000453:epidemiology; D005163:Factor Analysis, Statistical; D005260:Female; D005910:Glioma / Q000453:epidemiology / Q000401:mortality* / Q000601:surgery; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D011184:Postoperative Period; D011379:Prognosis; D016016:Proportional Hazards Models; D012044:Regression Analysis; D012307:Risk Factors; D016019:Survival Analysis