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Abstract from the SRS 2001 Annual Meeting
Marc Asher, MD
Sue Min Lai, PhD
Douglas Burton, MD
Barbara Manna, RN · (c -
Depuy Acromed) University of Kansas Medical Center, Kansas City, KS, USA The purpose
of this study is to evaluate the reproducibility and internal consistency of the
SRS-22 outcome survey. METHODS: This study was carried out using mail-in questionnaires
of the SRS-22 and the SF-36 outcomes instruments. These questionnaires were mailed
to 83 patients who had been previously surgically treated for idiopathic scoliosis
at this medical center. Fifty-eight of the eighty-three subjects responded. Fifty-one
of the first-time respondents also returned their second survey. The 48 responders
had an average age of 25 years (range 19 - 43) and 84% were female. The average
response time between the first and the second mail-in assessments was 28 days.
The time interval between the surgery and SRS-22 survey was 10.8 years. Individual
domain scores were evaluated with descriptive statistics, internal consistency
with the Cronbach a, test and re-test reproducibility with the intra-class correlation
coefficient (ICC), and concurrent validity with Pearson Coefficient Correlation
(r). RESULTS: The average domain scores (5 being the best and 1 the worst), based
on a sample of 58 responses were 4.2 for pain, 4.2 for self-image, 4.2 for function,
4.1 for mental health, and 4.5 for satisfaction. The calculated Cronbach a of
internal consistency for the five corresponding domains was pain 0.92, self image
0.75, function 0.86, mental health 0.98, and satisfaction 0.88. Test/retest intra
class correlations (n=51) were pain 0.96, self image 0.90, function 0.90, mental
health 0.87, and satisfaction 0.85. The calculated Cronbach a and ICC for the
SF-36 domains are quite compatible to those observed for the SRS-22. Concurrent
validity was r 0.70 or more for 14 relevant SF-36 domains. CONCLUSION: The SRS-22
has score distribution similar to the SF-36, is reliable (internally consistent
and reproducible) and valid in comparison to SF-36.
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