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Table 1 Baseline characteristics of participants (N = 397)

From: Depression in patients with knee osteoarthritis: risk factors and associations with joint symptoms

  Mean/ Numbers SD/ Percentage
Age (years) 63.3 7.1
Female sex (n, %) 193 48.6
Body mass index (kg/m2) 29.6 4.9
Serum 25-(OH)D levels (nmol/L) 43.7 12.2
Treatment group (n, %) 201 50.6
PHQ-9 score
 0–4 296 74.6
 5–9 70 17.6
  ≥ 10 31 7.8
Anti-depressant medication use (n, %) 17 4.3
Education
 School only (n, %) 49 12.4
 High school (n, %) 96 24.4
 University or higher (n, %) 249 63.2
Work status
 Full-time employed (n, %) 114 28.9
 Part-time/causal employment (n, %) 83 21.0
 Unemployed/home duties/retired (n, %) 198 50.1
Work type
 Manual (n, %) 128 32.8
 Office/professional (n, %) 262 67.2
WOMAC score
 Pain (0–500) 136.4 87.0
 Function (0–1700) 477.9 30.9
 Stiffness (0–200) 62.0 40.7
Multi-site joint pain, (n, %)
 No pain 240 60.5
 One site 133 33.5
 More than one site 24 6.0
Comorbidity, (n, %)
 No comorbidity 162 40.8
 One comorbidity 221 55.7
 More than one comorbidity 14 3.5
  1. PHQ-9 Patient health questionnaire depression scale; WOMAC Western Ontario and McMaster Universities Arthritis Index