Table 1.

Characteristics of men with knee osteoarthritis by occupational exposure.

	Occupational Exposures
	Heavy Lifting	Squatting/Kneeling and Heavy Lifting	Neither
n	40	47	98
Age, yrs (mean ± SD)	69 ± 9	64 ± 9	70 ± 9
Body Mass Index, kg/m2 (mean ± SD)	30.5 ± 4.9	31.2 ± 4.3	31.0 ± 4.9
% prior injury (to imaged knee)*	44	47	33
% prior knee surgery (to imaged knee)*	33	36	31

^*Based on self-report. SD: Standard deviation.