requireIsFirstDrugEntry: Restrict cohort to only the first cohort record per subject

In DrugUtilisation: Summarise Patient-Level Drug Utilisation in Data Mapped to the OMOP Common Data Model

Restrict cohort to only the first cohort record per subject

Description

Filter the cohort table keeping only the first cohort record per subject.

Usage

requireIsFirstDrugEntry(
  cohort,
  cohortId = NULL,
  name = omopgenerics::tableName(cohort)
)

Arguments

cohort	A cohort_table object.
cohortId	A cohort definition id to restrict by. If NULL, all cohorts will be included.
name	Name of the new cohort table, it must be a length 1 character vector.

Value

The cohort table having applied the first entry requirement.

Examples

library(DrugUtilisation)
library(dplyr, warn.conflicts = FALSE)

cdm <- mockDrugUtilisation()

cdm$cohort1 <- cdm$cohort1 |>
  requireIsFirstDrugEntry()

attrition(cdm$cohort1) |>
  glimpse()

DrugUtilisation documentation built on July 3, 2025, 1:08 a.m.