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Univariate analysis
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Multivariate analysis (baseline model)*
|
Multivariate analysis (final model)*
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|---|
|
Variable
|
OR (95% CI)
|
p
|
Adjusted OR (95% CI)
|
p
|
Adjusted OR (95% CI)
|
p
|
|---|
|
Sex (female vs male)
|
1.09 (0.70–2.05)
|
0.5
|
–
|
–
|
–
|
–
|
|
Diagnosis (PsA vs RA)
|
0.80 (0.42–1.52)
|
0.5
|
–
|
–
|
–
|
–
|
|
Current biologic DMARD
|
0.99 (0.58–1.69)
|
1.0
|
–
|
–
|
–
|
–
|
|
Current methotrexate
|
1.31 (0.81–2.12)
|
0.3
|
–
|
–
|
–
|
–
|
|
Current prednis(ol)one
|
0.90 (0.54–1.48)
|
0.7
|
–
|
–
|
–
|
–
|
|
Current hypertension
|
0.58 (0.35–0.98)
|
0.04
|
0.65 (0.38–1.11)
|
0.11
|
–
|
–
|
|
Current hyperlipidaemia
|
1.20 (0.67–2.14)
|
0.6
|
–
|
–
|
–
|
–
|
|
Current diabetes
|
1.04 (0.44–2.49)
|
0.9
|
–
|
–
|
–
|
–
|
|
Current smoker
|
1.22 (0.40–3.73)
|
0.7
|
–
|
–
|
–
|
–
|
|
Overweight or obese
|
0.51 (0.31–0.84)
|
0.01
|
0.59 (0.35–0.99)
|
0.04
|
0.56 (0.33–0.93)
|
0.03
|
|
University/tertiary education
|
1.20 (0.74–1.93)
|
0.5
|
–
|
–
|
–
|
–
|
|
Full time work or study
|
0.98 (0.57–1.66)
|
0.9
|
–
|
–
|
–
|
–
|
|
Age ≥ 65 years
|
1.17 (0.70–1.94)
|
0.6
|
–
|
–
|
–
|
–
|
|
Disease duration ≥5 years
|
0.68 (0.27–1.75)
|
0.4
|
–
|
–
|
–
|
–
|
|
Low self-reported disease activity (VAS ≤ 20)
|
1.88 (1.14–3.09)
|
0.01
|
1.69 (1.01–2.82)
|
0.05
|
1.71 (1.03–2.85)
|
0.04
|
|
Low pain (VAS ≤20)
|
1.57 (0.95–2.61)
|
0.08
|
–
|
–
|
–
|
–
|
- Combined analysis including RA and PsA respondents, N = 275
- OR odds ratio, CI confidence interval, RA rheumatoid arthritis, PsA psoriatic arthritis, DMARD disease modifying antirheumatic drug, VAS visual analogue scale
- *Variables with p ≤ 0.25 in the univariate logistic regression were entered into the multivariate logistic regression baseline model and non-significant covariates removed via backwards stepwise elimination until only significant covariates remained in the final model. Stepwise backwards elimination process can be seen in Additional file 1. Nagelkerke R2 for model = 0.06
