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) |