Significant independent predictors of sleep disturbances
| Obstructive Sleep Apnea (OSA)* diagnosis | Restless Leg Syndrome (RLS)* symptoms | Sleep Problems Index I (SPI-I)† | |
|---|---|---|---|
| Age, years | 1.04 (1.01, 1.07) | (ns) | −0.2 (0.01) |
| White race | (ns) | (ns) | −6.4 (0.02) |
| Low education (<high school) | (ns) | (ns) | 6.4 (0.004) |
| Smoking, ever | (ns) | (ns) | 4.6 (0.03) |
| Obesity | 4.6 (2.4, 8.8) | (ns) | (ns) |
| Asthma | 2.5 (1.1, 5.7) | (ns) | (ns) |
| RDCI (0–9) | 1.3 (1.1, 1.5) | 1.3 (1.1, 1.5) | 1.3 (0.02) |
| Pain rating (0–10) | (ns) | (ns) | 1.5 (0.002) |
| Disease activity (SLAQ) | 1.07 (1.01, 1.13) | 1.1 (1.03, 1.13) | 0.9 (<0.0001) |
* Tabled values are odds ratio (95% CI) from multiple logistic regression analyses
† Tabled values are beta (p-value) from multiple linear regression analysis. Higher scores reflect greater sleep problems
All regression models include age, race, education, ever smoking, obesity (BMI ≥30), concurrent asthma, Rheumatic Disease Comorbidity Index (RDCI), prednisone dose, pain rating, disease damage (BILD), and disease activity (SLAQ)