Table 3. Results of the hierarchical conditional logistic regression predicting work disability (n = 772)^*.

	Step
Variable	1	2	3	4
Age, per 5 years	1.3 (1.2–1.5)	1.3 (1.2–1.5)	1.3 (1.2–1.5)	1.2 (1.1–1.4)
Sex	0.9 (0.6–1.4)	0.8 (0.5–1.3)	0.8 (0.5–1.3)	1.0 (0.6–1.8)
Education	1.3 (0.9–1.8)	1.2 (0.9–1.8)	1.2 (0.9–1.7)	1.1 (0.7–1.7)
Personal income from employment ≤$25,000	2.7 (1.9–3.9)	2.4 (1.7–3.5)	2.4 (1.6–3.4)	1.7 (1.0–2.7)
Disease duration, per 5 years		1.0 (0.9–1.1)	1.0 (0.9–1.1)	1.0 (0.9–1.2)
HAQ functional limitation score		1.5 (1.1–2.0)	1.4 (1.0–1.9)	1.2 (0.8–1.7)
RA global severity†		1.1 (1.0–1.2)	1.1 (1.0–1.2)	1.1 (0.9–1.2)
General health status			1.2 (0.9–1.6)	1.2 (0.8–1.7)
Hours worked/week, per 4 hours				0.9 (0.8–0.9)
Occupational hand demand				0.8 (0.7–1.1)
Commuting difficulty				1.0 (0.9–1.1)
Self-employment				1.5 (0.9–2.4)
Professional/managerial job				0.8 (0.5–1.2)
Prefer to work part time‡				0.4 (0.2–0.6)
Prefer to work full time‡				0.2 (0.1–0.4)

^*Values are the odds ratio (95% confidence interval). HAQ = Health Assessment Questionnaire; RA = rheumatoid arthritis.

^†Measure of overall effect of rheumatoid arthritis

^‡Versus preference to not work.