User Manual: Inquisit Kessler Psychological Distress Scale K6


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								*Kessler Psychological Distress Scale K6*
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
last updated:  02-24-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 02-24-2022 Millisecond Software

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BACKGROUND INFO 	
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This script implements the Kessler Psychological Distress Scale K6.
The implemented procedure is based on:

Reference:

Kessler, R.C., Barker, P.R., Colpe, L.J., Epstein, J.F., Gfroerer, J.C., Hiripi, E., Howes, M.J, Normand, S-L.T., 
Manderscheid, R.W., Walters, E.E., Zaslavsky, A.M. (2003). 
Screening for serious mental illness in the general population Archives of General Psychiatry. 60(2), 184-189

https://www.hcp.med.harvard.edu/ncs/k6_scales.php
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OVERVIEW
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Scored question: Question1 with 6 5-point Likert questions scored on scale 0-4
several additional questions that do not contribute to the total score
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DURATION 
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the default set-up of the script takes appr. 1.5 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: 'k6.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: q1a-q1f (the main 6 questions) are scored on a scale 0 (none of the time) - 4 (all of the time)
									q2: 1 ('more often than usual: a lot') to 7 ('less often than usual: a lot')
									q3-q4: number of days
									q5: number of times
									q6: 1 ('all of the time') to 5 ('none of the time)
																		
									NO reversed scored questions
									
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: 'k6_summary.iqdat' (Inquisit Lab: one data file per participant)

inquisit.version:				Inquisit version run
computer.platform:				the platform the script was run on (win/mac/ios/android)
startdate:						date script was run
starttime:						time script was started
subjectid:						assigned subject id number
groupid:						assigned group id number
sessionid:						assigned session id number
elapsedtime:					time it took to run script (in ms); measured from onset to offset of script
completed:						0 = script was not completed (prematurely aborted); 
								1 = script was completed (all conditions run)
									
K6_totalscore:					the sum of questions q1a-q1f (scored on scale 0 'none of the time' to 4 'all of the time)	
								Range: 0-24

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QUESTIONNAIRE SET-UP & SCORING
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The scored questions in this survey are q1a-q1f. The additional questions do not contribute to scoring.