. Author manuscript; available in PMC: 2012 Jul 1.

Published in final edited form as: J Rheumatol. 2011 Apr 15;38(7):1390–1395. doi: 10.3899/jrheum.100743

Table 4.

Adjusted relative risk (RR) of total knee replacement (TKR): severity of Western Ontario and McMaster Universities pain score (WOMAC) pain versus consistency in a knee-based analysis. RR adjusted for age, sex, race, education, body mass index, depressive symptoms measured by CES-D, clinical site, occupation, and baseline cross-sectional radiographic Kellgren-Lawrence grade.

Severity of Pain, WOMAC	No FKP		Consistency of Pain Inconsistent FKP		Consistent FKP
Severity of Pain, WOMAC	Portion with TKR, %	Adj RR (95% CI)	Portion with TKR, %	Adj RR (95% CI)	Portion with TKR, %	Adj RR (95% CI)
Mild (0–2)	9/2410 (0.4)	1.0 (referent)	6/507 (1.2)	2.2 (0.7–6.8)	6/177 (3.4)	5.2 (1.8–15.2)
Moderate (> 2–6)	13/449 (2.9)	4.6 (2.0–10.4)	15/521 (2.9)	3.1 (1.3–7.4)	46/610 (7.5)	7.4 (3.6–15.0)
Severe (> 6–20)	2/75 (2.7)	3.2 (0.7–14.4)	11/218 (5.1)	4.7 (2.0–10.7)	94/881 (10.7)	8.0 (3.9–16.1)

FKP: frequent knee pain.