Table 2.
Baseline variables predictive of WPAI:SHP subscales at 6 and 12 months in 1003 AS patients
| Predictor | Odds ratio (95% CI) | |
| Outcome: absenteeism | ||
| Fatigue | 1.18 (0.92 to 1.51) | |
| % work time missed due to AS (> 0 vs 0) | 4.59 (2.91 to 7.25) | |
| Anxiety/depression | Some vs none | 1.77 (1.12 to 2.80) |
| Extreme vs none | 0.87 (0.26 to 2.86) | |
| Extreme vs some | 0.49 (0.15 to 1.57) | |
| Visit 12 months vs 6 months | 1.001 (0.70 to 1.44) | |
| Predictor | Standardized beta-coefficient (β) (95% CI) | |
| Outcome: presenteeism | ||
| Fatigue | 3.75 (2.14 to 5.36) | |
| Male vs female | −4.65 (−7.62 to −1.68) | |
| Age (years) | 4.48 (3.07 to 5.89) | |
| CRP | −1.83 (−3.53 to −0.13) | |
| % impairment while working due to AS | 6.25 (4.67 to 7.82) | |
| Visit 12 months vs 6 months | −0.99 (−2.57 to 0.60) | |
| Outcome: Work productivity loss | ||
| Fatigue | 1.81 (−0.40 to 4.02) | |
| Male vs female | −3.57 (−7.29 to 0.15) | |
| Age (years) | 5.22 (3.52 to 6.93) | |
| Pain | 2.77 (0.34 to 5.20) | |
| Pain at 12 months vs pain at 6 months | −2.49 (−4.49 to −0.49) | |
| % overall work impairment due to AS | 6.62 (4.53 to 8.71) | |
| Anxiety/depression | Some vs none | 3.76 (0.09 to 7.42) |
| Extreme vs none | 12.32 (1.38 to 23.26) | |
| Visit 12 months vs 6 months | −1.42 (−3.42 to 0.59) | |
| Outcome: Activity impairment | ||
| Fatigue | 2.62 (1.26 to 3.98) | |
| Age (years) | 5.07 (3.96 to 6.19) | |
| CRP | −2.76 (−3.85 to −1.67) | |
| % activity impairment due to AS | 8.51 (7.14 to 9.87) | |
| Anxiety/depression | Some vs none | 3.27 (0.85 to 5.68) |
| Extreme vs none | 10.74 (5.35 to 16.14) | |
| Visit 12 months vs 6 months | −1.10 (−2.35 to 0.15) | |
AS, ankylosing spondylitis; CI, confidence interval; CRP, C-reactive protein; RA, rheumatoid arthritis; VAS, visual analogue scale; WPAI:SHP, Work Productivity and Activity Impairment—Special Health Problems