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Table 3 Correlations of the neck disability index with pain intensity, pain on movement, health-related quality of life, and range of motion (in a subsample of n = 49)

From: Validation of the German version of the Neck Disability Index (NDI)

Variable Neck disability index
  Spearman’s ρ p
Pain intensity 0.22 <0.01
Pain on movement 0.39 <0.01
Health-related quality of life (SF-36)   
Physical functioning -0.40 <0.01
Physical role functioning -0.45 <0.01
Bodily pain -0.44 <0.01
General health perceptions -0.40 <0.01
Vitality -0.45 <0.01
Social functioning -0.42 <0.01
Emotional role functioning -0.30 <0.01
Mental health -0.36 <0.01
Physical component score -0.43 <0.01
Mental component score -0.32 <0.01
Range of motion (n = 49) -0.34 0.02