Table 2

Associations between each independent SES variable analyzed singly with each OA outcome.

Independent variables

Knee radiographic OA

OR, 95% CI

Bilateral Knee radiographic OA

OR, 95% CI

Symptomatic OA

OR, 95% CI

Bilateral Symptomatic OA

OR, 95%CI

Unadjusted odds ratios for each independent variable singly as associated with each outcome


Low educational attainment

2.07 (1.78, 2.41)**

2.29 (1.89, 2.78)**

2.23 (1.87, 2.66)**

1.89 (1.43, 2.49)**

Non-managerial occupation

1.39 (1.20, 1.61)**

1.53 (1.25, 1.86)**

1.49 (1.24, 1.78)**

1.43 (1.08, 1.90)*

Medium poverty rate, 12 to 25%

1.24 (1.03, 1.51)*

1.07 (0.83, 1.38)

1.28 (1.01, 1.62)*

1.14 (0.80, 1.63)

High poverty rate, > 25%

1.91 (1.54, 2.38)**

1.85 (1.40, 2.45)**

1.63 (1.25, 2.12)**

1.39 (0.92, 2.09)

Adjusted odds ratios for each independent variable singly as associated with each outcome


Low educational attainment

1.52 (1.28, 1.80)**

1.49 (1.20, 1.86)**

1.74 (1.42, 2.12)**

1.32 (0.97, 1.79)

Non-managerial occupation

1.26 (1.07, 1.48)**

1.24 (0.99, 1.55)

1.33 (1.09, 1.63)**

1.20 (0.88, 1.64)

Medium poverty rate, 12 to 25%

1.24 (1.01, 1.53)*

1.02 (0.78, 1.34)

1.23 (0.96, 1.57)

1.04 (0.71, 1.51)

High poverty rate, > 25%

1.92 (1.50, 2.46)**

1.64 (1.19, 2.27)**

1.44 (1.07, 1.94)*

1.15 (0.73, 1.82)


ยงAdjusted for age, gender, race, BMI, smoking, knee injury, and occupational activity score

* P < 0.05; ** P < 0.01: from test for OR = 1.

1 This table presents odds ratios and 95% confidence interval results of 24 logistic models (3 single SES variables, 4 outcomes, both unadjusted and adjusted).

Callahan et al. Arthritis Research & Therapy 2011 13:R169   doi:10.1186/ar3492

Open Data