. 2012 Mar;56(1):18–28.

Table 3.

NDI Search Results

Study	Sample	Reliability	Validity
Mehta et al³⁴	66 patients with neck pain assessed with DASH for upper extremity disability	N/A	Correlation of Quick-DASH / NDI = 0.83
Carreon et al³⁵	505 fusion patients: NDI scores compared to Health Transition Item of SF-36 (a form of Global Rating of Change (GRC))	N/A	One-year MCID = 7.5 / 50 One-year SCB = 9.5 / 50
Cleland et al²⁸	96 neck and arm pain subjects: correlation to GRC	N/A	Predictors of short-term (28-day) improvement (GRC) = – Age < 54 – Dominant arm not affected – looking down does not worsen symptoms – receiving manual therapy
Peolsson³⁶	95 neck and arm: follow-up scores	N/A	20% reduction in NDI is a reasonable criterion for success at 6 years post-surgery
Peolsson et al³⁷	34 neck and arm: factors predicting recovery	N/A	For 1 and 3-year follow-up: Normal DRAM most strongly predicted improvement on NDI – other factors were: non-smoking and low pre-operative pain
Cleland et al³⁸	38 neck and arm: psychometric properties	NDI test-re-test reliability = 0.68 [0.30, 0.90]	Median 21 days (13–31) / 6 treatments (5–7): MDC NDI = 10.2 MICD = 7.0