Construct Immunization Date

This function constructs the immunization date per individual by searching for the vaccine dates that satisfy the condition: vacc_date_col + immunization_delay <= limit_date, where limit_date is defined following the hierarchy: censoring_date_col, outcome_date_col, end_cohort. If a date is not provided/found the function takes the next one in the hierarchy. If several columns with vaccine dates are provided, the function selects by default the closest vaccine date to limit_date. However, it can also select the first vaccine date by setting take_first = TRUE.

Usage

get_immunization_date(
  data_set,
  outcome_date_col,
  censoring_date_col = NULL,
  immunization_delay,
  vacc_date_col,
  end_cohort,
  take_first = FALSE
)

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. NULL by default.

immunization_delay

Characteristic time in days before the patient is considered immune.

vacc_date_col

Name of the column(s) that contain the vaccine dates.

end_cohort

End date of the study.

take_first

FALSE: takes the latest vaccine date. TRUE: takes the earliest vaccine date.

Value

Immunization date