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						 MICHIGAN ALCOHOL SCREENING TEST (MAST) - original
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Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 02-04-2013
last updated:  10-09-2019 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 10-09-2019 Millisecond Software

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BACKGROUND INFO 	
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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

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OVERVIEW
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Questionnaire with 25 binary yes-no questions.

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DURATION 
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the default set-up of the script takes appr. 2 minutes to complete

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DATA FILE INFORMATION 
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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:						date and time script was run with the current group/subjectnumber 
subject, group, session:	  		 with the current subject/groupnumber/session id
build:							the Inquisit build 

q*_response:					response given (in assigned values)
									Scale: yes - no 
									(Note: the numeric responses are stored in the summary data file,
									responses can be weighted, see section Editable Parameters)
									
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)

computer.platform:			the platform the script was run on (win/mac/ios/android)
script.startdate:				date script was run
script.starttime:				time script was started
script.subjectid:				assigned subject id number
script.groupid:				assigned group id number
script.sessionid:				assigned session id number
script.elapsedtime:			time it took to run script (in ms); measured from onset to offset of script
script.completed:			0 = script was not completed (prematurely aborted); 
								1 = script was completed (all conditions run)

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

expressions.totalscore:		sum of all responses (The higher, the higher the 'alcoholic' response pattern)

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SCORING
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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

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EDITABLE CODE 
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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