Table 1.

Characteristics of the study participants, floor layers (n = 92) and graphic designers (n = 49).

Floor LayersGraphic Designers
Age, yrs (mean, SD)54.57.257.75.6
BMI, kg/m2 (mean, SD)26.23.426.64.8
Seniority, yrs (mean, SD)29.69.835.96.5
  ≤ 20, n (%)2021.812.1
  21–30, n (%)2729.31020.4
  31–35, n (%)2223.91020.4
  ≥ 36, n (%)2325.02857.1
Knee complaints††, n (%)4650.02448.9
Knee-straining sports*, n (%)4650.03673.5
Previous injury**, n (%)55.41020.4
Tibiofemoral osteoarthritis#, n (%)1010.9612.2
  • BMI: body mass index.

  • Duration of employment in the trade.

  • †† Ache, pain, or nuisance during the past 12 mo.

  • * Football, handball, badminton, tennis, volleyball, ice hockey, and weight lifting.

  • ** Fractures of the knee joint, meniscal injuries, cruciate ligament ruptures.

  • # MRI-assessed diffuse full-thickness cartilage loss on opposing femoral and/or tibial condyles with or without subarticular bone attrition and bone marrow edema.