title: Measuring fatigue in persons with multiple sclerosis: creating a crosswalk between the Modified Fatigue Impact Scale and the PROMIS Fatigue Short Form.
abstract: OBJECTIVE
  To create cross-walk tables to associate scores for the Modified Fatigue Impact Scale (MFIS) with scores for the Patient Reported Outcome Measurement Information System (PROMIS) Fatigue Short Form (SF) in persons with Multiple Sclerosis (MS).
  
  
  METHODS
  Cross-walk tables were created using equipercentile linking and based on data collected at one time point in a longitudinal study of persons with MS (N = 458). Validation of the tables was conducted using data collected at a subsequent time point (N = 444). Deviations between estimates and actual scores were compared across levels of fatigue. The impact of sample size on the precision of sample mean estimates was evaluated using bootstrapping.
  
  
  RESULTS
  Correlations between deviations and fatigue level for the PROMIS Fatigue SF and MFIS were (-0.31) and (-0.30), respectively, indicating moderately greater deviations with lower fatigue scores. Estimated sample means were impacted by sample size.
  
  
  CONCLUSIONS
  Cross-walk tables allow data from studies using different measures of fatigue to be combined to achieve larger sample sizes and to compare results. These tables are valid for group-level analyses with sample sizes of 150 or greater.
authors: Department of Rehabilitation Medicine, University of Washington, Box 356490, Seattle, WA 98195, USA. Vanessa.Noonan@vch.ca
authors: Vanessa K
authors: VK
authors: Noonan
authors: Karon F
authors: KF
authors: Cook
authors: Alyssa M
authors: AM
authors: Bamer
authors: Seung W
authors: SW
authors: Choi
authors: Jiseon
authors: J
authors: Kim
authors: Dagmar
authors: D
authors: Amtmann
mesh_terms: D000328:Adult; D005221:Fatigue / Q000145:classification* / Q000209:etiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000150:complications* / Q000503:physiopathology; D012016:Reference Values; D012720:Severity of Illness Index; D018434:Sickness Impact Profile