Table 3.

Baseline variables predictive of WPAI:SHP subscales at 6 and 12 months in 1747 RA patients

Predictor		Odds ratio (95% CI)
Outcome: absenteeism
Fatigue		1.23 (1.02 to 1.49)
Age (years)		1.20 (1.00 to 1.44)
CRP		0.82 (0.68 to 0.98)
% work time missed due to RA (> 0 vs 0)		4.75 (3.35 to 6.75)
Visit 12 months vs 6 months		1.10 (0.83 to 1.46)
Predictor		Standardized beta-coefficient (β) (95% CI)
Outcome: presenteeism
Fatigue		3.44 (2.17 to 4.71)
Age (years)		1.44 (0.26 to 2.63)
% impairment while working due to RA		9.36 (7.96 to 10.76)
% impairment at 12 months vs % impairment at 6 months		−1.98 (−3.39 to −0.58)
Visit 12 months vs 6 months		−1.16 (−2.57 to 0.24)
Outcome: Work productivity loss
Fatigue		4.16 (2.47 to 5.85)
% overall work impairment due to RA		9.43 (7.74 to 11.12)
Visit 12 months vs 6 months		−0.60 (−2.64 to 1.44)
Outcome: Activity impairment
Fatigue		1.52 (0.79 to 2.26)
Male vs female		−1.83 (−3.33 to −0.33)
Age (years)		3.25 (2.61 to 3.90)
% activity impairment due to RA		9.41 (8.59 to 10.23)
% activity impairment at 12 months vs % activity impairment at 6 months		−1.92 (−2.67 to −1.18)
Anxiety/depression	Some vs none	2.80 (1.40 to 4.20)
	Extreme vs none	5.81 (2.82 to 8.79)
Visit 12 months vs 6 months		−2.36 (−3.10 to −1.61)

CI, confidence interval; CRP, C-reactive protein; RA, rheumatoid arthritis; WPAI:SHP, Work Productivity and Activity Impairment—Special Health Problems