Table 1.

Study Instruments

Instrument	Description/construct	Use in study
Demographic questionnaire	20-Item questionnaire that collects demographic and general information such as age, marital status, education, employment status, ethnicity and reproductive history.	Enrolment
NIDA Quick Screen/ASSIST	9-Item combined NIDA Quick Screen and modified-ASSIST to screen for tobacco, alcohol and illicit drugs.	Enrolment, 1-week follow-up
4 P’s Plus	4-Item screener for alcohol and general substance use.	Enrolment, 1-week follow-up
SURP-P	3-Item screener for alcohol and substances	Enrolment, 1-week follow-up

ASSIST, Alcohol, Smoking, and Substance Involvement Screening Test; NIDA, National Institute on Drug Abuse; SURP-P, Substance Use Risk Profile-Pregnancy.