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Table 1 Sociodemographic and clinical characteristics of the psychometric sample (mean ± standard deviation)

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

Variable Total (n = 458) Responsiveness subsample (n = 49)
Gender: N female (%) 424 (76%) 40 (81.6%)
Age (in years) 49.89 ± 11.40 47.92 ± 10.59
Pain intensity (in mm VAS) 45.69 ± 20.77 44.33 ± 19.02
Pain duration (in years) 7.54 ± 7.52 8.01 ± 6.38
Neck disability index 32.75 ± 13.09 27.36 ± 9.42
Pain on movement (in mm VAS) 42.85 ± 20.52 40.76 ± 20.07
Health-related quality of life (SF-36)   
Physical functioning 75.32 ± 17.19 80.59 ± 14.48
Physical role functioning 44.14 ± 37.64 53.65 ± 34.97
Bodily pain 42.13 ± 13.87 46.82 ± 10.98
General health perceptions 60.05 ± 18.64 61.10 ± 19.04
Vitality 47.78 ± 18.58 47.55 ± 16.77
Social functioning 70.38 ± 23.58 72.96 ± 21.09
Emotional role functioning 64.61 ± 41.04 66.67 ± 39.51
Mental health 62.13 ± 17.62 64.41 ± 16.23
Physical component score 40.85 ± 7.93 43.21 ± 8.01
Mental component score 45.09 ± 11.63 45.28 ± 11.01
Range of motion - 45.52 ± 9.04
  1. Abbreviations: SF-36 Short form 36 health survey, VAS visual analog scale.