filter_tlfb: Filter TLFB data

In ABCDscores: Summary Scores of the Adolescent Brain Cognitive Development (ABCD) Study

Filter TLFB data

Description

This function filters the TLFB (Timeline Followback) data based on specified substance(s); period (estimated vs. detailed); number of days before the TLFB interview; weekend-only usage; co-use of other substances; and/or binge use.

Usage

filter_tlfb(
  data,
  substance = NULL,
  period = NULL,
  days = NULL,
  wknd = NULL,
  co_use = NULL,
  binge = NULL
)

Arguments

data	tibble. A data frame containing the TLFB raw data.
substance	character (vector). The substance(s) to compute the score for. Must be one or several of the following values: "'Fake' Marijuana or Synthetics" "Alcohol" "Anabolic Steroids" "Any Other Drug They Used to Get High" "Blunts or Combined Tobacco and Marijuana in Joints" "CBD (Non-Medical Use)" "Cathinones such as Bath Salts, Drone, or Meph" "Cigars, Little Cigars, or Cigarillos" "Cocaine or Crack Cocaine" "Concentrated Marijuana Tinctures" "Ecstasy, Molly, or MDMA" "Electronic Nicotine or Vaping Products" "GHB, Liquid G, or Georgia Homeboy" "Hallucinogen Drugs including LSD, PCP, Peyote, Mescaline, DMT, AMT, or Foxy" "Heroin, Opium, Junk, Smack, or Dope" "Hookah with Tobacco" "Inhalants" "Ketamine or Special K" "Marijuana Edibles" "Marijuana Infused Alcohol Drinks" "Methamphetamine, Meth, or Crystal Meth" "Nicotine Replacements" "OTC Cough or Cold Medicine, DXM, 'Lean', or 'Purple Drank'" "Prescription Anxiolytics, Tranquilizers, or Sedatives" "Prescription Pain Relievers or Opioids" "Prescription Stimulants" "Psilocybin, Magic Mushrooms, or Shrooms" "Salvia" "Smokeless Tobacco, Chew, or Snus" "Smoking Marijuana Flower" "Smoking Marijuana Oils or Concentrates" "Tobacco Cigarette" "Tobacco in a Pipe" "Vaped Marijuana Flower" "Vaped Marijuana Oils or Concentrates" "Marijuana (all forms)" "Nicotine (all forms)" (Default: NULL, i.e., all substances are considered.)
period	character (vector). The period for which the score is computed for. Must be one of "detailed" (last year before date of TLFB interview) or "estimated" (more than one year before date of TLFB). (Default: NULL, i.e., all periods are considered). Cannot be used in combination with days.
days	integer. Number of days before the TLFB interview to consider. (Default: NULL, i.e., all days are considered). Cannot be used in combination with period.
wknd	logical. Whether the score should be computed for weekends only (TRUE) or for week days only (FALSE). (Default: NULL, i.e., all days are considered).
co_use	character (vector). Co-use substance(s). Must be one or several of the possible values for substance listed above. Only days where the specified substance(s) was/were used together with (one of) the co-use substance(s) are considered. (Default: NULL, i.e., co-use is not considered). co_use cannot be specified without substance and can only contain substance(s) that are not specified in substance.
binge	(named list of) numeric. Binge threshold(s) for the substance(s). If only one value is provided, it is used, independent of the sex of the participant. If a list is provided, it must contain two named elements: "F" (female) and "M" (male) with the respective sex-specific binge thresholds. Only days where the the quantity of the substance(s) exceeds the specified threshold(s) are considered. (Default: NULL, i.e., binge behavior is not considered).

Value

A filtered data frame based on the specified criteria.

Examples

## Not run: 
filtered_data <- filter_tlfb(
  data,
  substance = "Alcohol",
  wknd_only = TRUE,
  period = "estimated",
  days = 30
)

## End(Not run)

ABCDscores documentation built on Sept. 11, 2025, 5:08 p.m.