title: Problems in the use of aggregate measures.
authors.forename: D L
authors.initials: DL
authors.lastname: McGee
authors.forename: R S
authors.initials: RS
authors.lastname: Cooper
authors.forename: Y
authors.initials: Y
authors.lastname: Liao
mesh_terms: D015982:Bias; D006801:Humans; D007182:Income; D015233:Models, Statistical; D009369:Neoplasms / Q000401:mortality*; D012044:Regression Analysis; D018401:Sample Size; D012959:Socioeconomic Factors; D016019:Survival Analysis