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Development of the Qualeffo-31, an osteoporosis-specific quality-of-life questionnaire

Schoor, NM ; Knol, DL ; Glas, CAW ; Ostelo, RWJG ; Leplege, A ; Cooper, C ; Johnell, Olof LU and Lips, P (2006) In Osteoporosis International 17(4). p.543-551
Abstract
Vertebral deformities are a common consequence of osteoporosis and are known to decrease quality of life. The Qualeffo-41 is a quality-of-life questionnaire especially developed for measuring quality of life in patients with vertebral deformities. It consists of 41 questions arranged in five domains: pain, physical function, social function, general health perception, and mental function. The objectives of this study were: (1) to develop a shorter version of the Qualeffo-41 by removing redundant questions; and (2) to investigate the scale characteristics, reliability, and validity of this shorter version. The study was performed using data from the Qualeffo validation study and the Multiple Outcomes of Raloxifene Evaluation (MORE) study.... (More)
Vertebral deformities are a common consequence of osteoporosis and are known to decrease quality of life. The Qualeffo-41 is a quality-of-life questionnaire especially developed for measuring quality of life in patients with vertebral deformities. It consists of 41 questions arranged in five domains: pain, physical function, social function, general health perception, and mental function. The objectives of this study were: (1) to develop a shorter version of the Qualeffo-41 by removing redundant questions; and (2) to investigate the scale characteristics, reliability, and validity of this shorter version. The study was performed using data from the Qualeffo validation study and the Multiple Outcomes of Raloxifene Evaluation (MORE) study. The analyses were performed in patients with vertebral deformities (n=579). Factor analysis on polychoric correlations and an item response theory (IRT) model, i.e., the generalized partial credit model (GPCM), were used to create a shorter version of Qualeffo-41. Using GPCM, scoring weights were computed for all items. Three items were removed from the data set because of too many missing values. Factor analysis identified three instead of five domains: (1) pain, (2) physical function, and (3) mental function. Five items had factor loadings < 0.4 and were not included in the GPCM. After excluding several items, the domains pain (four items), physical function (18 items), and mental function (nine items) showed a good, reasonable, and excellent fit, respectively. This indicates that the mental function domain and the pain domain are more unidimensional than the physical function domain. All three domains showed a very high correlation (r >= 0.95) with the corresponding domains of the Qualeffo-41. Qualeffo-31 was developed, consisting of three domains with a reasonable to excellent fit to the GPCM. Although the fit to the GPCM supports the construct validity of the Qualeffo-31, validation in a new study should be performed before using it in practice. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Qualeffo-41, Qualeffo-31, item response theory, quality of life, vertebral fracture
in
Osteoporosis International
volume
17
issue
4
pages
543 - 551
publisher
Springer
external identifiers
  • wos:000236356100007
  • scopus:33645233271
ISSN
1433-2965
DOI
10.1007/s00198-005-0024-7
language
English
LU publication?
yes
id
cb2bcbce-ef2b-4a68-9d34-eb21e777bd56 (old id 693447)
date added to LUP
2016-04-01 16:59:29
date last changed
2021-09-22 01:14:03
@article{cb2bcbce-ef2b-4a68-9d34-eb21e777bd56,
  abstract     = {Vertebral deformities are a common consequence of osteoporosis and are known to decrease quality of life. The Qualeffo-41 is a quality-of-life questionnaire especially developed for measuring quality of life in patients with vertebral deformities. It consists of 41 questions arranged in five domains: pain, physical function, social function, general health perception, and mental function. The objectives of this study were: (1) to develop a shorter version of the Qualeffo-41 by removing redundant questions; and (2) to investigate the scale characteristics, reliability, and validity of this shorter version. The study was performed using data from the Qualeffo validation study and the Multiple Outcomes of Raloxifene Evaluation (MORE) study. The analyses were performed in patients with vertebral deformities (n=579). Factor analysis on polychoric correlations and an item response theory (IRT) model, i.e., the generalized partial credit model (GPCM), were used to create a shorter version of Qualeffo-41. Using GPCM, scoring weights were computed for all items. Three items were removed from the data set because of too many missing values. Factor analysis identified three instead of five domains: (1) pain, (2) physical function, and (3) mental function. Five items had factor loadings &lt; 0.4 and were not included in the GPCM. After excluding several items, the domains pain (four items), physical function (18 items), and mental function (nine items) showed a good, reasonable, and excellent fit, respectively. This indicates that the mental function domain and the pain domain are more unidimensional than the physical function domain. All three domains showed a very high correlation (r &gt;= 0.95) with the corresponding domains of the Qualeffo-41. Qualeffo-31 was developed, consisting of three domains with a reasonable to excellent fit to the GPCM. Although the fit to the GPCM supports the construct validity of the Qualeffo-31, validation in a new study should be performed before using it in practice.},
  author       = {Schoor, NM and Knol, DL and Glas, CAW and Ostelo, RWJG and Leplege, A and Cooper, C and Johnell, Olof and Lips, P},
  issn         = {1433-2965},
  language     = {eng},
  number       = {4},
  pages        = {543--551},
  publisher    = {Springer},
  series       = {Osteoporosis International},
  title        = {Development of the Qualeffo-31, an osteoporosis-specific quality-of-life questionnaire},
  url          = {http://dx.doi.org/10.1007/s00198-005-0024-7},
  doi          = {10.1007/s00198-005-0024-7},
  volume       = {17},
  year         = {2006},
}