Table 3 Risk factors for osteophytosis.

	Initial model*		Final model†
	OR‡	95% CI	OR‡	95% CI
Age	0.70	0.46 to 1.07	—	—
Race (African American)	3.30	1.04 to 10.54	—	—
Duration of self‐reported diagnosis	0.43	0.19 to 1	—	—
WOMAC pain score	1.46	0.79 to 2.7	—	—
WOMAC stiffness score	1.44	0.79 to 2.64	1.91	1.29 to 2.82
Ipsilateral patellofemoral OA	1.55	0.7 to 3.45	—	—

OA, osteoarthritis; WOMAC, Western Ontario and McMaster Universities.

*The initial model included all variables within three domains (general clinical, OA clinical and radiographic) associated with the dependent variable (p⩽0.2).

†Backward selection of independent variables with p>0.05 until all remaining predictors were significant (p<0.05). There were no significant interactions.

‡OR for continuous independent variables are scaled to reflect the change in likelihood of progression for each SD increase in the independent variable.