Variables | Original Model* | Weighted Model‡ | |||
---|---|---|---|---|---|
RR (95% CI) | PAR, %† | RR (95% CI) | Change, % | ||
Fatigue | None/mild | 1.00 | 22 | 1.00 | — |
Moderate/severe | 1.60 (1.13–2.28) | 1.46 (1.04–2.06) | 9 | ||
Physical function | BASFI < 4 | 1.00 | 56 | 1.00 | — |
BASFI ≥ 4 | 3.46 (1.76–6.82) | 3.86 (1.97–7.54) | 12 | ||
Chronic widespread pain | No | 1.00 | 27 | 1.00 | — |
Yes | 1.92 (1.33–2.75) | 1.94 (1.35–2.79) | 1 | ||
Disease activity | BASDAI < 4 | 1.00 | 20 | 1.00 | — |
BASDAI ≥ 4 | 1.52 (1.09–2.12) | 1.49 (1.09–2.03) | 2 | ||
Spinal mobility | BASMI < 4 | 1.00 | 21 | 1.00 | — |
BASMI ≥ 4 | 1.52 (0.93–2.50) | 1.47 (0.89–2.40) | 3 |
↵* Model also adjusted for sex, age, education, symptom duration, employment, deprivation, driving status, alcohol consumption, and history of peripheral joint involvement.
↵† Population-attributable risks, based on original (unweighted) model.
↵‡ Adjusted for all factors in original model. In addition, weighted for nonresponse by inverse of sample fraction with respect to age, sex, BASDAI, BASFI, and history of extraspinal manifestations. PAR: population-attributable risks; RR: risk ratio; BASFI: Bath Ankylosing Spondylitis Functional Index; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASMI: Bath Ankylosing Spondylitis Metrology Index.