Table II.

The relationship between baseline quadriceps strength and knee pain worsening at 60-month follow-up adjusted for baseline age, BMI, PASE score, and history of knee surgery

Sex	Number of knees (% with progression)	Strength tertile (Range)	RR	(95% CI)	P-value
Male	604 (18.0)	High (referent) 137.00–270.00	1.00
	595 (20.5)	Middle 102.00–136.00	1.05	0.82–1.34	0.7082
	599 (21.4)	Low 20.00–101.00	1.01	0.78–1.32	0.9183
Female	941 (20.5)	High (referent) 77.00–206.00	1.00
	979 (25.4)	Middle 55.00–76.00	1.12	0.96–1.32	0.1545
	930 (31.1)	Low 20.00–54.00	1.28	1.08–1.52	0.0052