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. 2015 Jan 28;17(1):19. doi: 10.1186/s13075-015-0535-3

Table 1.

Characteristics of study participants (N = 198)

At time of MRI
Age (years) 67.1 (7.7)
Gender (n, % male) 85 (43.4)
BMI (kg m−2) 27.2 (4.6)
Heavy domestic chores in previous 7 days, n (%) 163 (76.2)
Vigorous physical activity in previous 7 days, n (%) 50 (23.4)
WOMAC pain score, median 20
Femoral head cartilage volume (mm3) 3259 (810)
Femoral head bone area (mm2) 1615 (266)
Femoral head cartilage defects, n (%)
Anterior 9 (4.5)
Central superolateral 72 (36.7)
Central inferomedial 104 (53.1)
Posterior 36 (18.2)
Femoroacetabular BMLs, n (%)
Anterior 34 (17.2)
Central superolateral 40 (20.4)
Central inferomedial 12 (6.1)
Posterior 22 (11.1)
Occupational heavy lifting n (%)
Aged 18 to 30 years 114 (59.7)
Previous 10 years 76 (38.8)
Persistence score
No time point 46 (28.7)
One time point 52 (32.5)
Both time points 62 (38.8)
Occupational stair climbing n (%)
Aged 18 to 30 years 37 (18.9)
Previous 10 years 23 (11.7)
Persistence score
No time point 122 (62.2)
One time point 28 (14.3)
Both time points 13 (6.6)

Mean (standard deviation) unless otherwise stated. MRI, magnetic resonance imaging; BMI, body mass index; WOMAC, Western Ontario and McMasters Universities Arthritis Index; BMLs, bone marrow lesions.