Substance Use Interview (SUI) summary scores • ABCDscores

Introduction

The Substance Use Interview (SUI) survey is used to collect background information on a participant’s substance use since their last visit. Additionally, the survey gathers follow-up information about use context, first use date, and other details. Scientifically, this survey allows us to understand the initiation and patterns of substance use in our participants. The information provided in the SUI is also used to decide whether a Timeline Followback interview is done with a given participant to access their substance use in more detail.

SUI summary score functions

We developed three basic functions that can be used to compute the SUI summary scores for all relevant substances by changing the value of the substance function parameter:

compute_su_y_sui__onset_useage(): Computes the age of use onset for a given substance.
compute_su_y_sui__reg_useage(): Compute the age of regular use for a given substance.
compute_su_y_sui__last__day_count(): Counts days since last use for a given substance.

❗Data requirements

The SUI item-level data is available to authorized users of the NBDC Data Hub as part of the tabulated data resource. Please refer to the Get started page for general information on how to assemble and download a dataset. For the computation of the SUI summary scores, please note the following requirements:

compute_su_y_sui__onset_useage() and compute_su_y_sui__reg_useage() require the ab_g_stc__cohort_dob column.
compute_su_y_sui__last__day_count() requires the ab_g_dyn__visit_dtt column.

Summary scores

The following table gives an overview of how each of the 100 SUI summary scores that are reported in the ABCD tabulated data resource have been computed using the three basic functions:

Substances dictionary

The following table provides the mapping of keywords used in the SUI summary scores to the substances they refer to: