Table 3.

Odds ratios of radiographic knee OA and knee symptoms by component of SES.

	Male			Female
	Knee OA	knee pain	Knee stiffness	Knee OA	knee pain	Knee stiffness
Education
College	1	1	1	1	1	1
High school	0.98 (0.607,1.581)	1.326 (0.635,2.767)	1.309 (0.953,1.798)	1.359 (0.855,2.16)	1.456 (0.733,2.889)	0.869 (0.564,1.34)
Middle school	1.958 (1.208,3.173)	1.962 (1.023,3.76)	1.421 (0.982,2.057)	1.716 (1.071,2.75)	1.679 (0.85,3.317)	1.055 (0.677,1.644)
Elementary	2.13 (1.38,3.286)	2.606 (1.446,4.696)	1.463 (1.027,2.086)	2.669 (1.713,4.158)	2.689 (1.421,5.091)	1.112 (0.72,1.717)
P for trend	< .0001	< .0001	0.055	< .0001	< .0001	0.1154
Income
Q4	1	1	1	1	1	1
Q3	1.029 (0.646,1.64)	0.726 (0.35,1.506)	1.145 (0.826,1.587)	0.961 (0.735,1.256)	1.09 (0.787,1.51)	1.175 (0.913,1.513)
Q2	1.278 (0.838,1.95)	1.566 (0.873,2.809)	0.985 (0.713,1.36)	1.13 (0.876,1.458)	1.146 (0.839,1.567)	1.068 (0.834,1.367)
Q1	1.567 (1.02,2.407)	1.918 (1.036,3.551)	1.123 (0.797,1.581)	1.505 (1.167,1.942)	1.596 (1.156,2.204)	1.342 (1.054,1.708)
P for trend	0.019	0.0037	0.7064	0.0002	0.0017	0.0419
Occupation
Managerial	1	1	1	1	1	1
Non-managerial	1.014 (0.967,1.062)	1.049 (0.978,1.125)	1.158 (1.116,1.2)	1.101 (1.074,1.129)	1.081 (1.052,1.11)	1.182 (1.152,1.212)
No job	1.022 (1.006,1.037)	1.024 (1.001,1.047)	1.088 (1.073,1.104)	1.047 (1.036,1.058)	1.056 (1.043,1.07)	1.106 (1.095,1.118)
P-value	0.0673	0.1844	0.0003	0.702	0.8448	0.7568

Adjusted for age, BMI, education, and income or occupation.

OA, osteoarthritis; SES, socioeconomic status.