title: Assessment of the psychometrics of a PROMIS item bank: self-efficacy for managing daily activities.
abstract: The aim of this study is to investigate the psychometrics of the Patient-Reported Outcomes Measurement Information System self-efficacy for managing daily activities item bank.
  
  
  
  The item pool was field tested on a sample of 1087 participants via internet (n = 250) and in-clinic (n = 837) surveys. All participants reported having at least one chronic health condition. The 35 item pool was investigated for dimensionality (confirmatory factor analyses, CFA and exploratory factor analysis, EFA), item-total correlations, local independence, precision, and differential item functioning (DIF) across gender, race, ethnicity, age groups, data collection modes, and neurological chronic conditions (McFadden Pseudo R (2) less than 10 %).
  
  
  
  The item pool met two of the four CFA fit criteria (CFI = 0.952 and SRMR = 0.07). EFA analysis found a dominant first factor (eigenvalue = 24.34) and the ratio of first to second eigenvalue was 12.4. The item pool demonstrated good item-total correlations (0.59-0.85) and acceptable internal consistency (Cronbach's alpha = 0.97). The item pool maintained its precision (reliability over 0.90) across a wide range of theta (3.70), and there was no significant DIF.
  
  
  
  The findings indicated the item pool has sound psychometric properties and the test items are eligible for development of computerized adaptive testing and short forms.
authors.affiliation: Department of Health Sciences and Research, Medical University of South Carolina, Rm B417, 151-B Rutledge Avenue, Charleston, SC, 29425-9620, USA.
authors.forename: Ickpyo
authors.initials: I
authors.lastname: Hong
authors.affiliation: Division of Occupational Therapy, Medical University of South Carolina, Rm 330, 151-B Rutledge Avenue MSC 962, Charleston, SC, 29425-9620, USA. velozo@musc.edu.
authors.forename: Craig A
authors.initials: CA
authors.lastname: Velozo
authors.affiliation: Department of Healthcare Leadership and Management, Medical University of South Carolina, Rm B415, 151-B Rutledge Avenue, Charleston, SC, 29425-9620, USA.
authors.forename: Chih-Ying
authors.initials: CY
authors.lastname: Li
authors.affiliation: Department of Occupational Therapy, University of Florida, Gainesville, FL, USA.|Department of Veterans Affairs, Center of Innovation on Disability and Rehabilitation Research, 1601 SW Archer Rd., Gainesville, FL, 32608, USA.
authors.forename: Sergio
authors.initials: S
authors.lastname: Romero
authors.affiliation: Division of Gerontology, Department of Epidemiology and Public Health, University of Maryland School of Medicine, Rm 213, Howard Hall, 660 West Redwood Street, Baltimore, MD, 21201-1559, USA.
authors.forename: Ann L
authors.initials: AL
authors.lastname: Gruber-Baldini
authors.affiliation: Department of Neurology, University of Maryland Parkinson Disease and Movement Disorders Center, Baltimore, MD, USA.|Parkinson's Disease and Movement Disorders and The Rosalyn Newman Distinguished Scholar in Parkinson's Disease, 110 Paca Street, Rm 3-S-127, Baltimore, MD, 21201-1559, USA.
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Shulman
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002908:Chronic Disease / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000071066:Patient Reported Outcome Measures; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D020377:Self Efficacy; D011795:Surveys and Questionnaires
keywords: Daily activities; Item response theory; Patient-reported outcome measure; Self-efficacy