title: The effect of missing values for covariates.
authors.forename: Gary
authors.initials: G
authors.lastname: Whitlock
authors.forename: Taane
authors.initials: T
authors.lastname: Clark
mesh_terms: D000063:Accidents, Traffic / Q000706:statistics & numerical data*; D015986:Confounding Factors, Epidemiologic; D004812:Epidemiologic Methods; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007182:Income; D008297:Male; D009520:New Zealand / Q000453:epidemiology; D012307:Risk Factors