compute_tlfb_dt: Compute TLFB first or last date of substance use

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

Compute TLFB first or last date of substance use

Description

Computes either the first or last date of use for a given (set of) substance(s). Optionally, allows to filter by period (detailed and/or estimated); only considering a specified number of days before the TLFB interview; only considering days with co-use of (a)other substance(s); and/or only binge use.

Usage

compute_tlfb_dt(
  data,
  name,
  substance = NULL,
  period = NULL,
  days = NULL,
  co_use = NULL,
  binge = NULL,
  position
)

Arguments

data	tibble. A data frame containing the TLFB raw data.
name	character. The name of the output column for the computed score.
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.
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).
position	character. The position of the substance use event. Must be one of "first" or "last".

Value

A tibble with the computed score for each participant/event.

See Also

compute_tlfb_abst()

Examples

## Not run: 
compute_tlfb_dt(
  data = data_tlfb,
  name = "su_y_tlfb__alc__first__cum_dt",
  substance = "Alcohol",
  position = "first"
)

## End(Not run)

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