___________________________________________________________________________________________________________________ YALE FOOD ADDICTION SCALE ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 04-14-2016 last updated: 03-03-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 03-03-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a computerized version of the Yale Food Addiction Scale. The Yale Food Addiction Scale was developed to identify people who exhibit dependence on high fat/high sugar foods. Reference: Gearhardt, A.N., Corbin, W.R., & Brownell, K.D. (2009). Preliminary validation of the Yale Food Addiction Scale. Appetite, 52, 430-436. Ashley N. Gearhardt, William R. Corbin, Kelly D. Brownell. (2012) . Yale Food Addiction Scale (YFAS). Measurement Instrument Database for the Social Science. Retrieved from www.midss.ie Instrument Authors: Ashley N. Gearhardt, William R. Corbin, Kelly D. Brownell http://www.midss.org/content/yale-food-addiction-scale-yfas ___________________________________________________________________________________________________________________ OVERVIEW ___________________________________________________________________________________________________________________ A questionnaire with 25 questions with different response scales, self-report ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 4 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'yalefoodaddictionscale.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: q1-q16: 0 (never) - 4 (4 or more times) q17-q24: 0 (no); 1 (yes) q25: 0 (1 or fewer times) - 4 (5 or more times) 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: 'yalefoodaddictionscale_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) Scales: 1 = criterion met; 0 = criterion not met AmountsTaken: Substance taken in larger amount and for longer period than intended; Questions #1, #2, #3 UnsuccessfulQuits: Persistent desire or repeated unsuccessful attempts to quit; Questions #4, #22, # 24, #25 TimeSpentObtaining: Much time/activity to obtain, use, recover; Questions #5, #6, #7 ReducedActivities: Important social, occupational, or recreational activities given up or reduced; Questions #8, #9, #10, #11 UseDespiteKnowledge: Use continues despite knowledge of adverse consequences (e.g., failure to fulfill role obligation, use when physically hazardous); Question #19 Tolerance: Tolerance (marked increase in amount; marked decrease in effect); Questions #20, #21 Withdrawal: Characteristic withdrawal symptoms; substance taken to relieve withdrawal; Questions #12, #13, #14 ClinicalSignificance: Use causes clinically significant impairment or distress; Questions #15, #16 SymptomCountScore: sum of the individual criterion scores (excluding clinical significance) = Symptom count without diagnosis (Range: 0-7) DiagnosisFoodDependence: 1 = diagnosis met (symptomcount > 3 AND clinical significance = 1); 0 = otherwise diagnosis not met q1-q25: contain the scored responses for question 1-25 according to the scoring guidelines NOTE: q17, q18, q23 are not scored - used as primers for other questions ___________________________________________________________________________________________________________________ QUESTIONNAIRE SET-UP & SCORING ___________________________________________________________________________________________________________________ 25 questions q1-q16, q25: 5 point Likert Questions q17-q24: yes/no questions SCORING (from scoring guidelines: http://www.midss.org/content/yale-food-addiction-scale-yfas): The following cut-offs were developed for the continuous questions. 0 = criterion not met, 1 = criterion is met The following questions are scored 0 = (0), 1 = (1): #19, #20, #21, #22 The following question is scored 0 = (1), 1 = (0): #24 The following questions are scored 0 = (0 thru 1), 1 = (2 thru 4): #8, #10, #11 The following questions are scored 0 = (0 thru 2), 1 = (3 & 4): #3, #5, #7, #9, #12, #13, #14, #15, #16 The following questions are scored 0 = (0 thru 3), 1 = (4): #1, #2, #4, #6 The following questions are scored 0 = (0 thru 4), 1 = (5): #25 NOTE: q17, q18, q23 are not scored - used as primers for other questions NORMS (from scoring guidelines: http://www.midss.org/content/yale-food-addiction-scale-yfas): Norms (undergraduates) Diagnosis of Food Dependence – 11.6% Median Symptom Count Score – 1.0 Withdrawal – 16.3% Tolerance – 13.5% Continued Use Despite Problems – 28.3% Important Activities Given Up – 10.3% Large Amounts of Time Spent – 24.0% Loss of Control – 21.7% Have Tried Unsuccessfully to Cut Down or Worried About Cutting Down – 71.3% Clinically Significant Impairment - 14%