Feng Tian1, Pengsheng Ni2, M J Mulcahey3, Ronald K Hambleton4, David Tulsky5, Stephen M Haley2, Alan M Jette2. 1. Boston University School of Public Health, Health & Disability Research Institute, Boston, MA. Electronic address: tianfeng@bu.edu. 2. Boston University School of Public Health, Health & Disability Research Institute, Boston, MA. 3. Jefferson School of Health Professions, Thomas Jefferson University, Philadelphia, PA. 4. University of Massachusetts, Amherst, MA. 5. University of Michigan, Ann Arbor, MI.
Abstract
OBJECTIVE: To use item response theory (IRT) methods to link scores from 2 recently developed contemporary functional outcome measures, the adult Spinal Cord Injury-Functional Index (SCI-FI) and the Pedi SCI (both the parent version and the child version). DESIGN: Secondary data analysis of the physical functioning items of the adult SCI-FI and the Pedi SCI instruments. We used a nonequivalent group design with items common to both instruments and the Stocking-Lord method for the linking. Linking was conducted so that the adult SCI-FI and Pedi SCI scaled scores could be compared. SETTING: Community. PARTICIPANTS: This study included a total sample of 1558 participants. Pedi SCI items were administered to a sample of children (n=381) with SCI aged 8 to 21 years, and of parents/caregivers (n=322) of children with SCI aged 4 to 21 years. Adult SCI-FI items were administered to a sample of adults (n=855) with SCI aged 18 to 92 years. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Five scales common to both instruments were included in the analysis: Wheelchair, Daily Routine/Self-care, Daily Routine/Fine Motor, Ambulation, and General Mobility functioning. RESULTS: Confirmatory factor analysis and exploratory factor analysis results indicated that the 5 scales are unidimensional. A graded response model was used to calibrate the items. Misfitting items were identified and removed from the item banks. Items that function differently between the adult and child samples (ie, exhibit differential item functioning) were identified and removed from the common items used for linking. Domain scores from the Pedi SCI instruments were transformed onto the adult SCI-FI metric. CONCLUSIONS: This IRT linking allowed estimation of adult SCI-FI scale scores based on Pedi SCI scale scores and vice versa; therefore, it provides clinicians with a means of tracking long-term functional data for children with an SCI across their entire lifespan.
OBJECTIVE: To use item response theory (IRT) methods to link scores from 2 recently developed contemporary functional outcome measures, the adult Spinal Cord Injury-Functional Index (SCI-FI) and the Pedi SCI (both the parent version and the child version). DESIGN: Secondary data analysis of the physical functioning items of the adult SCI-FI and the Pedi SCI instruments. We used a nonequivalent group design with items common to both instruments and the Stocking-Lord method for the linking. Linking was conducted so that the adult SCI-FI and Pedi SCI scaled scores could be compared. SETTING: Community. PARTICIPANTS: This study included a total sample of 1558 participants. Pedi SCI items were administered to a sample of children (n=381) with SCI aged 8 to 21 years, and of parents/caregivers (n=322) of children with SCI aged 4 to 21 years. Adult SCI-FI items were administered to a sample of adults (n=855) with SCI aged 18 to 92 years. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Five scales common to both instruments were included in the analysis: Wheelchair, Daily Routine/Self-care, Daily Routine/Fine Motor, Ambulation, and General Mobility functioning. RESULTS: Confirmatory factor analysis and exploratory factor analysis results indicated that the 5 scales are unidimensional. A graded response model was used to calibrate the items. Misfitting items were identified and removed from the item banks. Items that function differently between the adult and child samples (ie, exhibit differential item functioning) were identified and removed from the common items used for linking. Domain scores from the Pedi SCI instruments were transformed onto the adult SCI-FI metric. CONCLUSIONS: This IRT linking allowed estimation of adult SCI-FI scale scores based on Pedi SCI scale scores and vice versa; therefore, it provides clinicians with a means of tracking long-term functional data for children with an SCI across their entire lifespan.
Authors: M J Mulcahey; L C Vogel; M Sheikh; J C Arango-Lasprilla; M Augutis; E Garner; E M Hagen; L B Jakeman; E Kelly; R Martin; J Odenkirchen; A Scheel-Sailer; J Schottler; H Taylor; C C Thielen; K Zebracki Journal: Spinal Cord Date: 2016-11-15 Impact factor: 2.772
Authors: Bryce B Reeve; David Thissen; Darren A DeWalt; I-Chan Huang; Yang Liu; Brooke Magnus; Hally Quinn; Heather E Gross; Pamela A Kisala; Pengsheng Ni; Stephen Haley; M J Mulcahey; Susie Charlifue; Robin A Hanks; Mary Slavin; Alan Jette; David S Tulsky Journal: Qual Life Res Date: 2015-09-30 Impact factor: 4.147
Authors: Mary J Mulcahey; Stephen M Haley; Mary D Slavin; Pamela A Kisala; Pengsheng Ni; David S Tulsky; Alan M Jette Journal: J Pediatr Orthop Date: 2016 Oct-Nov Impact factor: 2.324
Authors: Axel Budde; Katja Baust; Leonie Weinhold; Mark Bernstein; Stefan Bielack; Catharina Dhooge; Lars Hjorth; Katherine A Janeway; Meriel Jenney; Mark D Krailo; Neyssa Marina; Rajaram Nagarajan; Sigbjørn Smeland; Matthew R Sydes; Patricia De Vos; Jeremy Whelan; Andreas Wiener; Gabriele Calaminus; Matthias Schmid Journal: Eur J Cancer Date: 2022-06-08 Impact factor: 10.002