Table 2.

The Odds Ratio of Presence of Pain in Each Group to the Normal Group ^a .

Individual Item of JKOM Pain and Stiffness	Medial		Lateral		Medial & Lateral
	Adjusted OR (95% CI)	P Value	Adjusted OR (95% CI)	P Value	Adjusted OR (95% CI)	P Value
Do you feel stiffness in your knees when you wake up in the morning?	1.38 (1.02-1.89)	0.0399	1.78 (1.29-2.46)	0.0004	2.66 (2.08-3.39)	<0.0001
Do you feel pain in your knees when you wake up in the morning?	1.41 (1.04-1.92)	0.0271	1.78 (1.29-2.46)	0.0004	2.99 (2.35-3.82)	<0.0001
How often do you wake up in the night because of pain in your knees?	1.37 (0.86-2.18)	0.1863	2.01 (1.27-3.20)	0.0029	2.85 (1.99-4.07)	<0.0001
Do you have pain in your knees when you walk on a flat surface?	1.48 (1.06-2.07)	0.0208	1.56 (1.09-2.23)	0.0141	3.04 (2.34-3.96)	<0.0001
Do you have pain in your knees when ascending stairs?	1.20 (0.90-1.60)	0.214	1.42 (1.04-1.93)	0.0275	2.66 (2.11-3.34)	<0.0001
Do you have pain in your knees when descending stairs?	1.23 (0.92-1.65)	0.1593	1.43 (1.04-1.95)	0.0269	2.81 (2.22-3.54)	<0.0001
Do you have pain in your knees when bending to floor or standing up?	1.31 (1.00-1.72)	0.05	1.42 (1.06-1.91)	0.0197	2.85 (2.28-3.56)	<0.0001
Do you have pain in your knees when standing?	1.14 (0.82-1.58)	0.4269	1.26 (0.89-1.78)	0.1952	2.45 (1.90-3.15)	<0.0001
Total	1.18 (0.91-1.54)	0.2195	1.35 (1.01-1.81)	0.0428	2.44 (1.95-3.05)	<0.0001

JKOM = Japanese Knee Osteoarthritis Measure; OR = odds ratio; CI = confidence interval; BMI = body mass index.

^aOdds ratio of the presence of the individual items on the “pain and stiffness” scale were calculated for each group in comparison to the Normal group, adjusted for age, sex, BMI, presence of depression and duration of knee symptoms. Boldface indicates statistical difference.