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Table 3 Cross-sectional correlations between the 3 versions of the NDI and key measures. All associations are significant at the p<0.01 level

From: A brief 5-item version of the Neck Disability Index shows good psychometric properties

   r (95% CI)  
  NDI NDI-5 NDI-5 linear
NPRS (n = 309) 0.71 (0.49, 0.85) 0.67 (0.42, 0.82) 0.69 (0.45, 0.84)
TSK (n = 261) 0.53 (0.23, 0.74) 0.54 (0.24, 0.75) 0.56 (0.27, 0.76)
PCS (n = 153) 0.64 (0.38, 0.81) 0.64 (0.38, 0.81) 0.59 (0.31, 0.78)
  1. NPRS Numeric Pain Rating Scale, TSK Tampa Scale for Kinesiophobia-11 items version, PCS Pain Catastrophizing Scale.