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											EAT-26 (Eating Attitudes Test)
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 12-08-2016
last updated:  01-06-2020 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 01-06-2020 Millisecond Software

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BACKGROUND INFO 	
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This script implements the EAT- 26 (Eating Attitudes Test) as described in:

Garner, D.M., Olmsted, M.P., Boh, Y. & Garfinkle, P.E. (1982). The Eating Attitudes Test: Psychometric features and 
clinical correlates. Psychological Medicine, 12, 871-878

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OVERVIEW
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26 6-point Likert questions											  

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DURATION 
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the default set-up of the script takes appr. 3 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: 'eat26.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)
									Note: Scoring:
									q1-q25: always (3). usually (2), often (1) - the remaining answer choices (0)
									q26: reversed coded
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: 'eat_26_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)

EAT26_total:					the total score
									Note: Scoring:
									q1-q25: always (3). usually (2), often (1) - the remaining answer choices (0)
									q26: reversed coded
																	
Note:
Norms are calculated based on data published by Garner et al. (1982).
The mean and standard deviation used in this script are derived from a group of female college students (N = 140)
									
zscore:							the z-score of the EAT27 Total Score with mean = 9.9 and sd = 9.2
pvalue:							the percentile of the EAT27 zscore

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NORMS
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Norms are calculated based on data published by Garner et al. (1982).
The mean and standard deviation used in this script are derived from a group of female college students (N = 140)

Mean = 9.9, SD = 9.2 (see Garner et al., 1982, table 2)

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INSTRUCTIONS 
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can be edited under section Editable Parameters

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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-
/pageinstructions2: 	the presented page instructions

Norming Statistics: The mean and standard deviation used in this script are derived from a group of female college students (N = 140) 
(see Garner et al., 1982, table 2)
/mean = 9.9				
/sd = 9.2