Return to the Graded Chronic Pain Scale - Revised (GCPS-R) page
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								*Graded Chronic Pain Scale - Revised (GCPS-R)*
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 05-06-2020
last updated: 05-06-2020 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Script Copyright © 05-06-2020 Millisecond Software

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BACKGROUND INFO 	
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This script implements the Graded Chronic Pain Scale-Revised (GCPS-R). 
The GCPS-R uses a standard 3-month recall period for assessing chronic pain and high-impact chronic pain, 
as well as a  1-week time frame for assessing current pain severity.

Reference

Von Korff, M.; DeBar, L.L.; Krebs, E.E,c; Kerns, R.D.; Deyo, R.A; Keefe, F.J.(2020).
Graded chronic pain scale revised: mild, bothersome, and high-impact chronic pain.
PAIN,161,651-661.
doi: 10.1097/j.pain.0000000000001758


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OVERVIEW
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This script runs 2 screening question regarding chronic pain during the last 3 months as well as
well as 4 questions regarding pain severity during the last week. 

If the answer to the first question is 0 ("no pain during the last 3 months"), the remaining questions are
skipped.
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DURATION 
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the default set-up of the script takes appr. 1 minute 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: 'gradedchronicpainscale_revised.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:
									R = automatically 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: 'gradedchronicpainscale_revised_summary.iqdat' (Inquisit Lab: one data file per 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)
								
/grade:							0: chronic pain absent
								1: mild chronic pain
								2: bothersome chronic pain
								3: high impact chronic pain

+ responses to the individual 6 questions								
								
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QUESTIONNAIRE SET-UP & SCORING
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6 likert-type questions:

grade scoring follows the algorithm outline in vonKorff et al (2020):
q1 = if response is Never/Some days => grade 0
q2 = if response is Most Days/Every Day => grade3
(q3+q4+q5) >= 12 => grade 2 else grade 1		
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INSTRUCTIONS 
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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:

/pageinstructions:					the general instructions provided