Table 1. Participant characteristics.
Variables Current (n = 1000) Former (n = 401) Control
Total No hip OA With hip OA Total No hip OA With hip OA (n = 52)
Age (yrs; mean ± SD) 26.1 ± 4.5 26 ± 4.4 29. 0 ± 4.6 36.46 ± 5.5 36.5 ± 5.6 36.2 ± 5.3 39.4 ± 6.6
BMI (kg/m²; mean ± SD) 23.3 ± 1.8 23.2 ± 1.8 23.5 ± 1.8 24.9 ± 2.2 24.9 ± 2.2 25.3 ± 1.8 29.4 ± 5.4
Duration of football career (yrs; mean±SD) 7.3 ± 4.4 7.3 ± 4.4 9.7 ± 5.4 11.3 ± 4.7 11.2 ± 4.7 12.0 ± 4.3 -
Duration of retirement (yrs; mean ± SD) - - - 5.3 ± 4.1 5,2 ± 4.0 5.8 ± 4.8 -
Played in highest league (%) 67.1 66.8 79.2 80.9 79.8 93.5 -
Employed (%) - 88.8 88.4 93.8 88.5
Voluntary retirement (%) - 70.6 71.1 65.6 -
Level of education (%)
No school 2.1 2.1 0 0.5 0 6.3 -
Nursery/elementary 3 3.1 0 2.6 2.8 0 -
High School 45.2 45.5 33.3 28.1 29.2 15.6 -
Vocational/Technical school 15.8 15.9 12.5 7.9 7.2 15.6 -
College, university or equivalent 33.9 33.4 54.2 60.9 60.7 62.5 -
OA = osteoarthritis, SD = standard deviation, BMI = body mass index.