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Table 1 Descriptive statistics for the whole, derivation and validation sets

From: Mapping the neck disability index to SF-6D in patients with chronic neck pain

Characteristic Whole set (n = 272) Derivation set (n = 180) Validation set (n = 92)
Age (year): mean (SD) 39.9 (12.3) 39.8 (12.4) 40.3 (11.4)
Female (%) 57.8 % 60.0 % 52.9 %
BMI(kg/m2): mean (SD) 21.3 (3.17) 21.4 (3.2) 21 (3.1)
College education (%) 44.0 % 45.8 % 42.9 %
Disease duration (months): mean (SD) 27.4 (7.37) 27.7 (7.45) 27 (7.2)
Physical activity ≥3 times a week 21.1 % 21.0 % 21.3 %
Smoking (%) 17.2 % 17.7 % 16.2 %
Working with computer >6 hours a day (%) 44.2 % 44.5 % 43.5 %