Table 5.

Knee pain and physical function by sex-specific tertile of quadriceps strength^*

	Sex-specific tertile of quadriceps strength
	Low (referent)	Middle	High
VAS pain score, 0–100 mm
Baseline†	50.8 (44.1, 57.4)	40.8 (34.6, 46.9)	35.1 (28.5, 41.7)
Followup†	51.3 (44.6, 57.9)	36.1 (29.9, 42.2)	35.6 (29.0, 42.2)
Change	0.9 (−6.5, 8.3)	−2.9 (−9.6, 3.8)	2.3 (−5.0, 9.5)
WOMAC physical function subscale score, 0–68
Baseline‡	30.2 (27.3, 33.2)	23.9 (21.2, 26.6)	20.3 (17.4, 23.2)
Followup‡	30.7 (27.4, 34.0)	23.6 (20.6, 26.5)	21.7 (18.5, 24.9)
Change	1.0 (−1.8, 3.8)	−0.05 (−2.6, 2.5)	1.7 (−1.0, 4.5)

^*Values are mean scores (95% confidence intervals) adjusted for age, BMI, sex, duration of followup, and cartilage scores. See Table 1 for definitions.

^†Statistically significant difference among tertiles of quadriceps strength (P = 0.002, P = 0.0003, and P = 0.4 for baseline, followup, and change, respectively, in VAS pain scores).

^‡Statistically significant difference among tertiles of quadriceps strength (P< 0.0001, P< 0.0001, and P = 0.5 for baseline, followup, and change, respectively, in WOMAC physical function subscale scores).