TY - JOUR
T1 - Psychometric Properties of the Satisfaction With Life Scale in People With Traumatic Brain, Spinal Cord, or Burn Injury
T2 - A National Institute on Disability, Independent Living, and Rehabilitation Research Model System Study
AU - Amtmann, Dagmar
AU - Bocell, Fraser D.
AU - Bamer, Alyssa
AU - Heinemann, Allen W.
AU - Hoffman, Jeanne M.
AU - Juengst, Shannon B.
AU - Rosenberg, Marta
AU - Schneider, Jeffery C.
AU - Wiechman, Shelley
AU - McMullen, Kara
N1 - Publisher Copyright:
© The Author(s) 2017.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - This study evaluated the measurement properties of the Satisfaction With Life Scale (SWLS) in a sample of 17,897 people with spinal cord injury (48%, n = 8,566), traumatic brain injury (44%, n = 7,941), and burn injury (8%, n = 1,390), 1 year following injury. We examined measurement invariance across the groups, unidimensionality, local independence, reliability from a classical test and item response theory (IRT) framework, and fit to a unidimensional IRT model. The results support unidimensionality and local independence of the SWLS. Reliability was adequate from a classical test and IRT perspective. IRT analysis found that the SWLS could be improved by using only five response categories rather than seven and by removing the fifth item, “If I could live my life over, I would change almost nothing.” This item functions poorly and reduces instrument reliability. With these revisions, the SWLS is a useful instrument to monitor an important outcome of trauma rehabilitation.
AB - This study evaluated the measurement properties of the Satisfaction With Life Scale (SWLS) in a sample of 17,897 people with spinal cord injury (48%, n = 8,566), traumatic brain injury (44%, n = 7,941), and burn injury (8%, n = 1,390), 1 year following injury. We examined measurement invariance across the groups, unidimensionality, local independence, reliability from a classical test and item response theory (IRT) framework, and fit to a unidimensional IRT model. The results support unidimensionality and local independence of the SWLS. Reliability was adequate from a classical test and IRT perspective. IRT analysis found that the SWLS could be improved by using only five response categories rather than seven and by removing the fifth item, “If I could live my life over, I would change almost nothing.” This item functions poorly and reduces instrument reliability. With these revisions, the SWLS is a useful instrument to monitor an important outcome of trauma rehabilitation.
KW - Satisfaction With Life Scale
KW - burn injury
KW - item response theory
KW - measurement invariance
KW - spinal cord injury
KW - traumatic brain injury
UR - http://www.scopus.com/inward/record.url?scp=85041567927&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041567927&partnerID=8YFLogxK
U2 - 10.1177/1073191117693921
DO - 10.1177/1073191117693921
M3 - Article
C2 - 29214853
AN - SCOPUS:85041567927
SN - 1073-1911
VL - 26
SP - 695
EP - 705
JO - Assessment
JF - Assessment
IS - 4
ER -