Table 2.

Cross-sectional Association of Unilateral Hip Pain with Baseline Knee Pain and Joint Space Narrowing (JSN) in the Contralateral vs. Ipsilateral Knee.

Outcome	RRR* (95% CI) [p-value] for outcome in the Contralateral vs. Ipsilateral Knee**
WOMAC Knee Pain	Unadjusted	Adjusted for RHOA and knee K-L Grade
Mild vs. No Pain	0.70 (0.49, 1.02) [0.068]	0.69 (0.46, 1.02) [0.064]
Severe vs. No Pain	0.40 (0.28, 0.56) [<0.0001)	0.39 (0.27, 0.57) [< 0.0001]
Knee JSN	Unadjusted	Adjusted for RHOA
Mild (1) vs. No JSN (0)	1.13 (0.85, 1.50) [0.398]	1.15 (0.85, 1.55) [0.340]
Moderate [52] vs. No JSN (0)	1.27 (0.90, 1.80) [0.163]	1.62 (1.09, 2.38) [0.015]

^*Relative risk ratios [32] and 95% confidence intervals (CI) estimated from clustered multinomial regression models.

^**An individual’s contralateral and ipsilateral limbs are identified in relation to the limb with hip pain.