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Table 1 Characteristics of the study population (n = 294)

From: The association of body-mass index and depressed mood with knee pain and activity limitations in knee osteoarthritis: results from the Amsterdam osteoarthritis cohort

Characteristic Value Missing (%)
Demographics   
 Age (years), mean ± SD 61.1 ± 7.4  
 Female, n (%) 188 (63.9)  
 Marital status, n (%)   15 (5.1)
  Single/living alone 54 (19.4)
  Married/living together 225 (80.6)
 Education level, n (%)   10 (3.4)
  Primary school 12 (4.2)
  Secondary school 173 (60.9)
  Higher professional education/university 99 (34.9)
Clinical factors   
 Duration of symptoms, n (%)   18 (6.1)
  0–1 year 31 (11.2)
  1–5 years 90 (32.6)
  > 5 years 155 (56.2)
 KL-grade < 2, n (%) 80 (27.9) 7 (2.4)
 KL-grade ≥ 2 , n (%) 207 (72.1)
  right knee 28 (9.8)
  left knee 35 (12.2)
  both knees 144 (50.2)
 Comorbidity, CIRS total score (range: 0–52), median (IQR) 2 (1–4) 2 (0.7)
Independent variables   
 BMI, kg/m2, mean ± SD 29.2 ± 5.5  
 HADS depression score (range: 0–21), median (IQR) 3 (1–6)  
Dependent variables   
 NRS knee pain last week(range: 0-10), mean ± SD 5.0 ± 2.2 4 (1.4)
 WOMAC physical function score (range: 0–68), mean ± SD 25.1 ± 13.1 4 (1.4)
 Get up and go test (sec.), mean ± SD 11.2 ± 5.0 1 (0.3)
  1. SD, Standard deviation. IQR, Interquartile range. KL-grade, Kellgren and Lawrence grade. CIRS, Cumulative Illness Rating Scale. BMI, Body-mass index. HADS, Hospital Anxiety and Depression Scale. NRS, Numeric rating scale. WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.