get_time_to_event_at function

Construct Time-to-Event at

This function returns both the time-to-event until a reference number of days, as provided in at, and the outcome status at the same point. It uses the exposure time as an auxiliary variable to calculate the time-to-event. The starting point for counting the time-to-event is t0_follow_up, which is determined based on whether a matching strategy is used or not. If the event occurs before the reference date, the end date of the exposure period is used to calculate the time-to-event. This accounts for whether censoring or an event occurred. The outcome status is determined based on whether the outcome date coincides with the end of the follow-up period.

get_time_to_event_at(
  data_set,
  outcome_date_col,
  censoring_date_col,
  end_cohort,
  at
)

Arguments

• data_set: data.frame with cohort information.
• outcome_date_col: Name of the column that contains the outcome dates.
• censoring_date_col: Name of the column that contains the censoring date.
• end_cohort: End date of the study.
• at: Time to truncate the follow-up period

Returns

data.frame containing time_to_event and outcome_status