Create inclusion dates from all the inclusion events
Source:R/create-inclusion-dates.R
create_inclusion_dates.RdThis function takes the output from
join_inclusions() and defines the final inclusion dates, raw and stable
based on all inclusion event types. Since inclusion requires at least two
events (can be multiple events of the same type or any combination of
different types), this function keeps only those with 2 or more events. E.g.,
an individual with two elevated HbA1c tests followed by a glucose-lowering
drug purchase is included at the latest elevated HbA1c test. Had the second
HbA1c test not been performed (or had it returned a result below the
diagnostic threshold), this person would instead have been included at the
date of the first purchase of glucose-lowering drugs.
Arguments
- inclusions
Output from
join_inclusions().- stable_inclusion_start_date
Cutoff date after which inclusion events are considered reliable (e.g., after changes in drug labeling or data entry practices). Defaults to "1998-01-01" which is one year after obstetric codes are reliable in the GLD data (since we use LPR data to drop rows related to gestational diabetes). This limits the included cohort to individuals with inclusion dates after this cutoff date.
Value
The same type as the input data, default as a tibble::tibble(),
with the pnr and date columns along with the columns from the input
that's needed to classify T1D.
It also creates two new columns:
raw_inclusion_date: Date of raw inclusion, the second earliest recorded event for each individual.stable_inclusion_date: Same as raw inclusion date, but set toNAif the raw inclusion date is before the stable inclusion start date.