TY - JOUR
T1 - Reliability and Validity Testing of the Quality of Life in Late-Stage Dementia Scale
AU - Resnick, Barbara
AU - Galik, Elizabeth
AU - Kolanowski, Ann
AU - Van Haitsma, Kimberly
AU - Boltz, Marie
AU - Ellis, Jeanette
AU - Behrens, Liza
AU - Flanagan, Nina M.
N1 - Publisher Copyright:
© 2018, The Author(s) 2018.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Background/rationale: This study tested the psychometric properties of the Quality of Life in Late-Stage Dementia (QUALID) Scale using Rasch analysis. The QUALID includes 11 items with a 5-point response scale. Scores range from 11 to 55, and lower scores indicate higher quality of life (QoL). Methods: Baseline data from a randomized clinical trial including 137 residents from 14 nursing homes were used. Psychometric testing included item mapping, evaluation of response categories, item reliability, construct validity based on INFIT and OUTFIT statistics, and convergent validity based on correlations between QoL and pain, agitation, depression, and function. Results: The Cronbach α was.89. All the items except “appears physically uncomfortable” fit the model. There was a significant relationship between QoL and depressive symptoms (r =.71, P =.001), pain (r =.26, P =.01), physical function (r = −.19, P =.03), and agitation (r =.56, P =.001). The categories were appropriately used. Item mapping suggested a need for easier items.
AB - Background/rationale: This study tested the psychometric properties of the Quality of Life in Late-Stage Dementia (QUALID) Scale using Rasch analysis. The QUALID includes 11 items with a 5-point response scale. Scores range from 11 to 55, and lower scores indicate higher quality of life (QoL). Methods: Baseline data from a randomized clinical trial including 137 residents from 14 nursing homes were used. Psychometric testing included item mapping, evaluation of response categories, item reliability, construct validity based on INFIT and OUTFIT statistics, and convergent validity based on correlations between QoL and pain, agitation, depression, and function. Results: The Cronbach α was.89. All the items except “appears physically uncomfortable” fit the model. There was a significant relationship between QoL and depressive symptoms (r =.71, P =.001), pain (r =.26, P =.01), physical function (r = −.19, P =.03), and agitation (r =.56, P =.001). The categories were appropriately used. Item mapping suggested a need for easier items.
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U2 - 10.1177/1533317518765133
DO - 10.1177/1533317518765133
M3 - Article
C2 - 29575907
AN - SCOPUS:85044739826
SN - 1533-3175
VL - 33
SP - 277
EP - 283
JO - American journal of Alzheimer's disease and other dementias
JF - American journal of Alzheimer's disease and other dementias
IS - 5
ER -