Keeps only the adult patients in the sample.
1 2  | OnlyAdults(study.sample, age.variable.name = "age", age.cutoff = 18,
  remove.missing = TRUE)
 | 
study.sample | 
 Data frame. The study sample. No default.  | 
age.variable.name | 
 Character vector of length 1. The name of the age variable. Defaults to "age".  | 
age.cutoff | 
 Numeric vector of length 1. The age cutoff. Defaults to 18, i.e. only observations with an age less than 18 are kept in the sample.  | 
remove.missing | 
 Logical vector of length 1. If TRUE all observations with missing age, as detected by is.na, are removed from the sample. Defaults to TRUE.  | 
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