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Table 1 Characteristics of the study population

From: Symptomatic knee disorders in floor layers and graphic designers. A cross-sectional study

  Floor layers Graphic designers
  (n=134) (n=120)
Age, years (mean, SD) 52.6 6.9 57.9 5.9
Duration of employment, years (mean, SD) 29.2 10.2 35.6 8.6
BMI, kg/m2 (mean, SD) 26.4 3.8 26.0 3.9
Knee complaints during past 12 months (yes %) 70 52.2 46 38.3
Knee-straining sports* (yes: n, %) 71 53.0 80 66.7
Knee osteoarthritis
  Tibio-femoral, TF OA (grade 1–3), (n %) 22 16.4 15 12.5
  Patellofemoral, PF OA (grade 1–3), (n %) 12 9.0 21 17.5
KOOS:
  Pain (mean, SD) 79.98 19.9 89.40 14.3
  Symptom (mean, SD) 81.28 17.2 89.14 12.3
  ADL (mean, SD) 82.22 18.9 88.91 16.0
  Sport_re (mean, SD) 69.51 28.3 78.15 25.9
  QOL (mean, SD) 67.82 26.6 77.94 23.5
Meniscal tears (n=85)** (n=40)**
  Medial (n, %) 56 65.9 19 47.5
  Lateral (n, %) 12 14.1 8 20.0
  1. *Defined as football, handball, badminton, tennis, volleyball, ice hockey, and weight lifting.
  2. **Missing: seven floor layers and nine graphic designers, who did not answer the KOOS questionnaire.