Table 2. Mean perceived lifetime risk by demographic characteristics and number of knee OA risk Factors.

This table portrays Knee OA Risk Calculator derived risk compared to perceived risk as reported by study participants. We present information for both lifetime and 10-year risk across factors: age, BMI, sex, race, education level, family history, history of injury, and occupational exposure to risk factors. p-values correspond to the difference in perceived risk between subjects across a given factor (e.g. the difference between men and women’s perceived risk)

Factor	Lifetime Risk			10-Year Risk
	Actual	Perceived	p-value*	Actual	Perceived	p-value*
Age
< 35	25%	48%	0.6058	3%	25%	0.3361
>= 35	25%	47%		4%	28%
BMI
>= 30	39%	54%	0.0189	6%	31%	0.0184
< 30	21%	46%		3%	24%
Sex
Male	22%	42%	0.0001	3%	22%	0.0002
Female	29%	54%		4%	31%
Race
White	26%	49%	0.2168	4%	26%	0.8336
Non-White	22%	44%		3%	26%
Education
College grad	23%	45%	0.0341	3%	23%	0.0014
No college grad	28%	51%		4%	31%
Family History
Present	29%	53%	<0.0001	4%	29%	0.0002
Absent	17%	36%		2%	19%
History of Injury
Present	38%	58%	0.0004	6%	33%	0.0036
Absent	22%	45%		3%	24%
Occupational Exposure
Present	29%	53%	0.0003	4%	31%	<0.0001
Absent	22%	43%		3%	21%

^*p-value for difference between perceived risk across risk factors (eg. perceived risk of male vs. female subjects)