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Table 1 Personal and health characteristics in the case- and control group

From: Relative difference among 27 functional measures in patients with knee osteoarthritis: an exploratory cross-sectional case-control study

ICF Variables Cases
(n = 28)
Controls
(n = 31)
M or Med diff M or Med
d or WG
95% CI
Statistics
t, χ2, U
P-value
Personal factors Female, n (%) 18 (64) 16 (52)    379 (χ2) 0.3294
Age, yrs., M (SD) 61.7 (6.4) 55.3 (8.0) 6.4 2.6, 10.2 3.4 (t) 0.0014†
Height, m, M (SD) 1.72 (0.10) 1.73 (0.09) −0.02 −0.07, 0.03 − 0.7 (t) 0.517
Weight, kg, M (SD) 82.9 (12.7) 80.4 (16.6) 2.5 −5.2, 10.3 0.7 (t) 0.517
BMI, kg/m2, M (SD) 24.3 (3.5) 25.2 (5.1) 1.1 −1.1, 3.3 1.0 (t) 0.317
Education, n (%)       
 secondary school (10 yrs) 1 (4) 0 (0)     
 high school (13 yrs) 6 (21) 6 (19)     
 graduate (16 yrs) 14 (50) 13 (42)     
 post graduate (18 yrs. +) 7 (25) 12 (39)    368 (U) 0.281
Dominant leg (right, left, n) 26, 2 28, 3     
Patients’ body function & structure & activity factors Yrs since diagnosis, M (SD) 10.2 (8.6)    6.9, 13.6   
Yrs of knee pain, n (%)       
 1 yrs 2 (7)      
 1 to 3 yrs. 3 (11)      
 3 to 10 yrs 7 (25)      
 > 10 yrs 16 (57)      
Affected knee (n, %)       
 One 14 (50)      
 Both 14 (50)      
Pain medication (n, %)       
 None 15 (54)      
 Paracetamol 5 (18)      
 NSAIDs 5 (18)      
 Opoids 2 (7)      
 Others 1 (4)      
TSK Fear of mov., M (SD) 24.4 (7.7)    21.4, 27.4   
PSFS Activity 1, Med (IQR) 3.0 (5.0)    1.0, 5.0   
  Case-group only     
X-ray grade (n knees, %) Inv. leg Uninv. leg     
 No X-rays taken 0 (0) 10 (36)     
 KL-grade II 9 (32) 9 (32)     
 KL-grade III 17 (61) 8 (29)     
 KL-grade IV 2 (7) 1 (4)     
  1. Notes. Case-group = patients with knee osteoarthritis; control-group = individuals without knee complaints; ICF = the International Classification of Function, Disability, and Health of the WHO; M = mean; Med = median; diff = difference between groups; d = 95% difference between groups; WG = 95% difference within a group; BMI = body mass index; NSAIDs = Non-Steroid Anti-Inflammatory Drugs; TSK = Tampa Scale of Kinesiophobia; mov. = movement/reinjury; PSFS = Patient-Specific Functional Scale questionnaire; KL = Kellgren-Lawrence Grade, † = highly significant result