Return to the Michigan Alcoholism Screening Test page

Author: Katja Borchert, Ph.D. ( for Millisecond Software, LLC
Date: 02-04-2013
last updated:  04-17-2018 by K.Borchert for Millisecond Software LLC

Script Copyright ©  04-17-2018 Millisecond Software


This script implements the original Michigan Alcohol Screening Test (MAST) with 25 YES/NO questions* for a 
self-assessment of social and vocational issues related to heavy drinking as published in:

It was published by:
Selzer, M.L. (1971). The Michigan Alcoholism Screening Test: The quest for a new diagnostic instrument.
Am J Psychiatry, 127, 1653-1658.

* The wording for question 1, 3, 11, 12 was slightly modified for this script

Questionnaire with 25 binary yes-no questions.

The default data stored in the data files are:

(1) Raw data file: 'MAST.iqdat' (a separate file for each participant)

The raw questionnaire data are saved under "MAST.iqdat"
numeric scores are saved in values.q1-values.q22 in MAST_summary.iqdat

date, time, group, subject:		date and time script was run with the current group/subjectnumber 
build:							the Inquisit build 

q*_response:					response given (in assigned values)								
q*_latency:						how much time (in ms) the participant spent on the surveypage with this particular question (the last time this particular surveypage was visited)

(2) Summary data file: 'MAST_summary*.iqdat' (a separate file for each participant)

build:							Inquisit build
computer.platform:				the platform the script was run on
date, time, subject:			date and time script was run with the current subjectnumber 
script.elapsedtime:				time it took to run script (in ms)
completed:						0 = script was not completed (script aborted prematurely); 1 = script was completed (all conditions run)

Summarydata for each participant: file saves the scores for the subscales and totalscore as well as the scores for individual items
(responses are reversed scored were appropriate)

T alcoholic responses to the different questions are weighted, with the least discriminatory alcoholic 
responses receiving a 1, more serious discriminatory responses receiving a 2, and diagnostic responses
receiving a 5
Go to "Editable Parameters" to check/edit the default scoring for this questionnaire

Interpretation (Selzer, 1971)
* Totalscore <= 3: nonalcoholic
* Totalscore = 4 : suggestive of alcoholism
* Totalscore > 4: alcoholism

check below for (relatively) easily editable parameters, stimuli, instructions etc. 
Keep in mind that you can use this script as a template and therefore always "mess" with the entire code to further customize your experiment.

The parameters you can change are:

q1maxscore....q25maxscore:			the (maximum) score for the alcoholic response 

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