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Table 5 Clinical subgroup analysis of SDC and MIC for the NDI. GPE on pain (3-5 = unchanged)

From: The influence of study population and definition of improvement on the smallest detectable change and the minimal important change of the neck disability index

  SDC MIC Sensitivity Specificity
No radiation (N = 47) 11.0 2.5 0.750 0.889
Radiation (N = 54) 11.0 2.5 0.654 0.963
Baseline < 24 (N = 49) 6.8 2.5 0.882 0.871
Baseline ≥24 (N = 52) 13.0 4.0 0.600 1.000