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 % |