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Table 1 Demographic characteristics of the patients with neck pain and healthy subjects*

From: The intra- and inter-rater reliability of five clinical muscle performance tests in patients with and without neck pain

  Healthy subject (n = 30) Patients (n = 33) P-value for group difference†
Gender, no. of females, % 17 ≈ 57% 25 ≈ 76% 0.108
Age, years 34 (14.7) 54 (15.1) >0.000
Height, cm 173.7 (9.8) 171.9 (9.3) 0.468
Body mass, Kg 70.5 (12.8) 74.9 (15.9) 0.232
BMI, kg/m2 24.6 (3.3) 23.9 (3.3) 0.454
VAS pain score (0-100 score), mm 1.0 (3.5) 49.8 (21.5) >0.000
NDI (0-50 score) 1.2 (2.8) 16.0 (8.1) >0.000
Education level    
  Ground school, number, % 2 ≈ 7% 10 ≈ 30%  
  High school, number, % 14 ≈ 47% 12 ≈ 36%  
  Undergraduate, number, % 10 ≈ 33% 7 ≈ 21%  
  Graduate, number, % 4 ≈ 13% 3 ≈ 9%  
  Doctoral degree, number, % 0 1 ≈ 3% 0.134
  1. Cm = centimeters, Kg = kilogram, mm = millimeters, BMI = Body Mass Index, VAS = Visual Analogue Scale from 0-100 mm, where 0 represent the best result, i.e. more healthy. NDI = Neck Disability Index from 0-50, where 50 represents the best result, i.e. more healthy. Ground school = 9-10 years of education, High school = 10-12 years of education, Undergraduate = 13-15 years of education, Graduate = 15-17 years of education, Doctoral degree = 18-20% years of education. *Values are the mean ± SD unless otherwise indicated. † P values are based on 2-sample independent t-tests. Bold numbers = P values less than 0.05.