___________________________________________________________________________________________________________________ EATING DISORDER INVENTORY (EDI) ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 05-15-2012 last updated: 02-22-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-22-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements the Eating Disorder Inventory (EDI) as described in: Garner, D.M., Olmstead, M.P., & Poliviy, J. (1983). Development and Validation of a Multidimensional Eating Disorder Inventory for Anorexia Nervosa and Bulimia. Int'l Journal of Eating Disorder, 2, 15-34. ___________________________________________________________________________________________________________________ OVERVIEW ___________________________________________________________________________________________________________________ The EDI contains the following 8 subscales/subtests (64 questions total): 1. Drive for Thinness (7 questions) 2. Bulimia (10 questions) 3. Body Dissatisfaction (7 questions) 4. Ineffectiveness (9 questions) 5. Perfectionism (10 questions) 6. Interpersonal Distrust (8 questions) 7. Interoceptive Awareness (6 questions) 8. Maturity Fears (7 questions) ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 5 minutes to complete ________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'edi.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 selected response options) Note: corresponding values (0-3) are assigned at the end of the survey and are used to calculate summary variables 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: 'edi_summary*.iqdat' (a separate file for each 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) Note: The scoring of responses is done as described by Garner et al (1983): the most "anorexic" response scores a 3, the one below it scores a 2, the next a 1 and the rest a 0. totalscore: the total score across subscales (range: 0-192) Subscale Scores with z-scores and p-values By default, the z-scores are calculated using the mean and standard deviations (calculated based on reported standard errors) for the Female control sample (N=577) published in Garner et al (1983), table 3. If gender is known to be male, then the appropriate statistics are used instead. Note: p-values report the z-score percentile values. 1. subtest1 (Drive for Thinness): 7 questions, range: 0-21 with z-score1 and p-value1 Female: mean = 5.0 (5.28), Male: mean = 1.6 (3.09) 2. subtest2 (Bulimia): 10 questions, range: 0-30 with z-score2 and p-value2 Female: mean = 2.0 (3.36), Male: mean = 1.0 (1.8) 3. subtest3 (Body Dissatisfaction): 7 questions, range: 0-21 with z-score3 and p-value3 Female: mean = 10.2 (7.69), Male: mean = 3.9 (5.02) 4. subtest4 (Ineffectiveness): 9 questions, range: 0-27 with z-score4 and p-value4 Female: mean = 2.0 (3.60), Male: mean = 1.6 (3.09) 5. subtest5 (Perfectionism): 10 questions, range 0-30 with z-score5 and p-value5 Female: mean = 5.2 (3.84), Male: mean = 6.2 (3.87) 6. subtest6 (Interpersonal Distrust): 8 questions, range 0-24 with z-score6 and p-value6 Female: mean = 2.2 (2.88), Male: mean = 3.1 (3.09) 7. subtest7 (Interoceptive Awareness): 6 questions, range 0-18 with z-score7 and p-value7 Female: mean = 2.9 (11.29), Male: mean = 1.4 (5.02) 8. subtest8 (Maturity Fears): 7 questions, range 0-21 with z-score8 and p-value8 Female: mean = 2.5 (7.92), Male: mean = 2.7 (5.67) as well as raw data responses: textbox.Age.response, dropdown.gender.response, textbox.Weight.response, textbox.Height.response ___________________________________________________________________________________________________________________ QUESTIONNAIRE SET-UP ___________________________________________________________________________________________________________________ The EDI contains the following 8 subscales/subtests (64 questions total): 1. Drive for Thinness (7 questions) 2. Bulimia (10 questions) 3. Body Dissatisfaction (7 questions) 4. Ineffectiveness (9 questions) 5. Perfectionism (10 questions) 6. Interpersonal Distrust (8 questions) 7. Interoceptive Awareness (6 questions) 8. Maturity Fears (7 questions) The script runs the survey and saves the raw data in the file EDI.dat. Summary data (such as totalscore, scores on subscales etc) is saved in the data file EDI_summarydata.dat. Demographic questions such as age, gender, weight and height are optional. By default, they are run. ___________________________________________________________________________________________________________________ EDITABLE CODE ___________________________________________________________________________________________________________________ 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: /runDemographicQuestions true: survey runs demographics questions at the beginning (default) false: survey only runs the actual EDI questions