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#' @title Metadata About UDS Groupings
#'
#' @description A table of the substances assessed in three clinical trials via
#' urine drug screen (UDS) and their groupings.
#'
#' @details This table indicates which substances were screened in each trial.
#' The first column (`substance`) is drawn from labels which appear in case
#' report forms for the three clinical trials. The remaining three columns
#' hold `"NO"` if a substance was not screened in that trial, or a grouping
#' label indicating what type of drug was screened. The ungrouped data can be
#' found in \link{all_drugs}.
#'
#' For example, `"Opiate 300 ng"` and `"Oxycodone"` are assigned to the
#' grouping label `"Opioid"`, and they were assessed in each clinical trial
#' (so none of the rows show `"NO"`). In contrast, while `"Opiate 2000 ng"` is
#' also assigned to the grouping label `"Opioid"`, it was neither assessed in
#' ctn_0027 nor ctn_0030; thus, the grouping label is `"NO"` for these trials.
#' For more details, see the
#' [Harmonization Information](../doc/harmonization.html#uds) vignette.
#'
#' @docType data
#'
#' @usage data(meta_substance_groups_uds)
#'
#' @format A tibble with `r scales::comma(nrow(meta_substance_groups_uds))` rows and
#' `r ncol(meta_substance_groups_uds)` variables:
#'
#' \describe{
#' \item{**Substance**}{
#'
#' | _Type:_ | factor (First/Reference level = `r levels(meta_substance_groups_uds$Substance)[1]`) |
#' | -------------- | ------------- |
#' | | |
#' | _Description:_ | substances screened by UDS per study; names drawn from trial case report forms |
#' | | |
#' | _Levels:_ | `r levels(meta_substance_groups_uds$Substance)` |
#'
#' }
#' \item{**CTN-0027**}{
#'
#' | _Type:_ | factor (First/Reference level = Alcohol) |
#' | -------------- | ------------- |
#' | | |
#' | _Description:_ | Derived label used to group substances of interest, or "NO" if the substance was not screened for in ctn_0027 |
#' | | |
#' | _Levels:_ | Alcohol, Amphetamine, Benzodiazepine, Cocaine, Methadone, NO, Opioid, THC |
#'
#' }
#' \item{**CTN-0030**}{
#'
#' | _Type:_ | factor (First/Reference level = Amphetamine) |
#' | -------------- | ------------- |
#' | | |
#' | _Description:_ | Derived label used to group substances of interest, or "NO" if the substance was not screened for in ctn_0030 |
#' | | |
#' | _Levels:_ | Amphetamine, Benzodiazepine, Buprenorphine, Cocaine, Methadone, NO, Opioid, THC |
#'
#' }
#' \item{**CTN-0051**}{
#'
#' | _Type:_ | factor (First/Reference level = Amphetamine) |
#' | -------------- | ------------- |
#' | | |
#' | _Description:_ | Derived label used to group substances of interest, or "NO" if the substance was not screened for in ctn_0051 |
#' | | |
#' | _Levels:_ | Amphetamine, Barbiturate, Benzodiazepine, Buprenorphine, Cocaine, Methadone, NO, Opioid, THC |
#'
#' }
#' }
"meta_substance_groups_uds"
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