Identify patients who were admitted already prior to study entry

Hospital acquired COVID is recorded explicitly in 2 places for some patients. A large difference between admission date and enrollment date (<21 days) is suggestive in other cases. The data is probably only collected in COVID cases so shoudl be treated with caution.

Usage

derive_nosocomial_status(df, v)

Arguments

df

the dataframe.

v

the value set. usually precomputed by the augment framework the value set can be explicitly supplied with v = get_value_sets(df)

Value

a dataframe