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							DEPRESSION ANXIETY STRESS SCALE (DASS) - 21 items
SCRIPT INFO

Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 01-15-2013
last updated:  01-07-2016 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Copyright ©  01-07-2016 Millisecond Software


BACKGROUND INFO

											*Purpose*
This script implements the short version of the Depression Anxiety and Stress Scale (DASS) with 21 items 
as published on: http://www2.psy.unsw.edu.au/groups/dass/

This script uses the American version published.

											  *Task*
21 4-point Likert scale to assess Anxiety, Depression and Stress over the past week.



DATA FILE INFORMATION: 
The default data stored in the data files are:

(1) Raw data file: 'DASS21.iqdat'

date, time, subject:			date and time script was run with the current 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: 'DASS21_summary*.iqdat' (a separate file for each participant)

script.startdate:				date script was run
script.starttime:				time script was started
script.subjectid:				subject id number
script.groupid:					group id number
script.elapsedtime:				time it took to run script (in ms)
computer.platform:				the platform the script was run on
/completed:						0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run)
totalscore:						calculates the total score (double the sum of all scores)
Depression/Anxiety/Stress:		subscale scores (double the sum of all scores for a particular subscale)
/q1-q21:						the score for each individual question
/number_misseditems:			counts how many items were not answered 
									(only relevant if /required = false for the individual questions)
/misseditems:					a string variable that saves all questions that were skipped 
									(only relevant if /required = false for the individual questions)




OVERVIEW: From the website:
"General description of the scales

The DASS is a set of three self-report scales designed to measure the negative emotional states of 
depression, anxiety and stress.  The DASS was constructed not merely as another set of scales to measure conventionally 
defined emotional states,  but to further the process of defining, understanding, and measuring the 
ubiquitous and clinically significant emotional states usually described as depression, anxiety and stress. 
The DASS should thus meet the requirements of both researchers and scientist-professional clinicians.[...]"

There are two versions: a long version with 42 items (DASS42.iqx) and a short version with 21 items (DASS21.iqx).

Compared to the long version, the short version contains 7 items per subscale.

"The Depression scale assesses dysphoria, hopelessness, devaluation of life, self-deprecation, 
lack of interest/involvement, anhedonia, and inertia. 
The Anxiety scale assesses autonomic arousal, skeletal muscle effects, situational anxiety, 
and subjective experience of anxious affect. 
The Stress scale is sensitive to levels of chronic non-specific arousal. It assesses difficulty relaxing, 
nervous arousal, and being easily upset/agitated, irritable/over-reactive and impatient. 

Subjects are asked to use 4-point severity/frequency scales to rate the extent to which they have 
experienced each state over the past week. Scores for Depression, Anxiety and Stress are calculated 
by summing the scores for the relevant items.[...]"

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