Summarise patient characteristics

In CohortCharacteristics: Summarise and Visualise Characteristics of Patients in the OMOP CDM

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>", message = FALSE, warning = FALSE,
  fig.width = 7
)

library(CDMConnector)
if (Sys.getenv("EUNOMIA_DATA_FOLDER") == "") Sys.setenv("EUNOMIA_DATA_FOLDER" = tempdir())
if (!dir.exists(Sys.getenv("EUNOMIA_DATA_FOLDER"))) dir.create(Sys.getenv("EUNOMIA_DATA_FOLDER"))
if (!eunomia_is_available()) downloadEunomiaData()

Introduction

In this example we're going to summarise the characteristics of individuals with an ankle sprain, ankle fracture, forearm fracture, or a hip fracture using the Eunomia synthetic data.

We'll begin by creating our study cohorts.

library(duckdb)
library(CDMConnector)
library(dplyr, warn.conflicts = FALSE)
library(ggplot2)
library(CodelistGenerator)
library(PatientProfiles)
library(CohortCharacteristics)

con <- dbConnect(duckdb(), dbdir = eunomiaDir())
cdm <- cdmFromCon(
  con = con, cdmSchem = "main", writeSchema = "main", cdmName = "Eunomia"
)

cdm <- generateConceptCohortSet(
  cdm = cdm,
  name = "injuries",
  conceptSet = list(
    "ankle_sprain" = 81151,
    "ankle_fracture" = 4059173,
    "forearm_fracture" = 4278672,
    "hip_fracture" = 4230399
  ),
  end = "event_end_date",
  limit = "all"
)
settings(cdm$injuries)
cohortCount(cdm$injuries)

Summarising study cohorts

Now we've created our cohorts, we can obtain a summary of the characteristics in the patients included in these cohorts.

chars <- cdm$injuries |>
  summariseCharacteristics(ageGroup = list(c(0, 49), c(50, Inf)))
chars |>
  glimpse()

Now we have these results, we can create a table with an overall summary of the people in each cohort.

tableCharacteristics(chars)

chars |>
  filter(variable_name == "Age") |>
  plotCharacteristics(
    plotStyle = "boxplot",
    colour = "cohort_name",
    facet = c("cdm_name")
  )

Stratified summaries

We can also generate summaries that are stratified by some variable of interest. In this case we add an age group variable to our cohort table and then stratify our results by age group.

chars <- cdm$injuries |>
  addAge(ageGroup = list(
    c(0, 49),
    c(50, Inf)
  )) |>
  summariseCharacteristics(strata = list("age_group"))

tableCharacteristics(chars,
  groupColumn = "age_group"
)

chars |>
  filter(variable_name == "Prior observation") |>
  plotCharacteristics(
    plotStyle = "boxplot",
    colour = "cohort_name",
    facet = c("age_group")
  ) +
  coord_flip()

Summaries including presence in other cohorts

medsCs <- getDrugIngredientCodes(
  cdm = cdm,
  name = c("acetaminophen", "morphine", "warfarin")
)
cdm <- generateConceptCohortSet(
  cdm = cdm,
  name = "meds",
  conceptSet = medsCs,
  end = "event_end_date",
  limit = "all",
  overwrite = TRUE
)

chars <- cdm$injuries |>
  summariseCharacteristics(cohortIntersectFlag = list(
    "Medications prior to index date" = list(
      targetCohortTable = "meds",
      window = c(-Inf, -1)
    ),
    "Medications on index date" = list(
      targetCohortTable = "meds",
      window = c(0, 0)
    )
  ))

These results will automatically be included when we create our table with patient characteristics.

tableCharacteristics(chars)

We can now also plot our results for these medication cohorts of interest.

plot_data <- chars |>
  filter(
    variable_name == "Medications prior to index date",
    estimate_name == "percentage"
  )

plot_data |>
  plotCharacteristics(
    plotStyle = "barplot",
    colour = "variable_level",
    facet = c("cdm_name", "cohort_name")
  ) +
  scale_x_discrete(limits = rev(sort(unique(plot_data$variable_level)))) +
  coord_flip() +
  ggtitle("Medication use prior to index date")

Summaries using concept sets

Instead of creating cohorts, we could have directly used our concept sets for medications when characterising our study cohorts.

chars <- cdm$injuries |>
  summariseCharacteristics(conceptIntersectFlag = list(
    "Medications prior to index date" = list(
      conceptSet = medsCs,
      window = c(-Inf, -1)
    ),
    "Medications on index date" = list(
      conceptSet = medsCs,
      window = c(0, 0)
    )
  ))

Although, like here, concept sets can lead to the same result as using cohorts it is important to note this will not always be the case. This is because the creation of cohorts will have involved the collapsing of overlapping records as well as imposing certain requirements, such as only including records that were observed during an an ongoing observation period. Meanwhile, when working with concept sets we will instead be working directly with record-level data.

tableCharacteristics(chars)

Summaries using clinical tables

More generally, we can also include summaries of the patients' presence in other clinical tables of the OMOP CDM. For example, here we add a count of visit occurrences

chars <- cdm$injuries |>
  summariseCharacteristics(
    tableIntersectCount = list(
      "Visits in the year prior" = list(
        tableName = "visit_occurrence",
        window = c(-365, -1)
      )
    ),
    tableIntersectFlag = list(
      "Any drug exposure in the year prior" = list(
        tableName = "drug_exposure",
        window = c(-365, -1)
      ),
      "Any procedure in the year prior" = list(
        tableName = "procedure_occurrence",
        window = c(-365, -1)
      )
    )
  )

tableCharacteristics(chars)

Summaries including additional variables

TO ADD

CohortCharacteristics documentation built on Oct. 1, 2024, 5:08 p.m.