Abstract
Objective
To assess reliability, construct validity, responsiveness, and interpretability for
Neck OutcOme Score (NOOS), Neck Disability Index (NDI), and Short Form–36 (SF-36)
in neck pain patients.
Study Design and Setting
Internal consistency was assessed by Cronbach alpha. Test-retest reliability was evaluated
by intraclass correlation coefficient (ICC), and measurement error was estimated from
the standard error of measurement. Responsiveness was assessed as standardized response
mean (SRM) and interpretability from the minimal important difference (MID). Construct
validity was tested correlating subscale scores from NOOS and SF-36 and NDI items.
Results
At baseline, 196 neck pain patients were included. Cronbach α was adequate for most
NOOS subscales, NDI, and SF-36 with few exceptions. Good to excellent reliability
was found for NOOS subscales (ICC 0.88–0.95), for NDI, and for SF-36 with few exceptions.
For NOOS, minimal detectable changes varied between 1.1 and 1.9, and construct validity
was supported. SRMs were higher for NOOS subscales (0.19–0.42), compared to SF-36
and NDI. MID values varied between 15.0 and 24.1 for NOOS subscales.
Conclusions
In conclusion, the NOOS is a reliable, valid, and responsive measure of self-reported
disability in neck pain patients, performing at least as well or better than the commonly
used SF-36 and NDI.
Keywords
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Article info
Publication history
Published online: March 31, 2016
Accepted:
March 21,
2016
Identification
Copyright
© 2016 Elsevier Inc. All rights reserved.
