| Variable | Crude OR | Adjusted OR | 95% CI |
|---|---|---|---|
| Individual characteristics | |||
| Age (years) | |||
| 19–24 | 0.048 | 0.068 | 0.03–0.16 |
| 25–34 | 0.052 | 0.062 | 0.029–0.13 |
| 35–44 | 0.11 | 0.12 | 0.06–0.25 |
| 45–54 | 0.32 | 0.36 | 0.18–0.75 |
| 55–64 | 0.80 | 0.93 | 0.45–1.9 |
| 65–74 | 1.5 | 1.6 | 0.69–3.7 |
| ≥75 (Reference) | 1.0 | 1.0 | Reference |
| Antiepileptic medication | 1.6 | 1.5 | 1.2–1.9 |
| Proton pump inhibitor | 1.7 | 1.3 | 1.0–1.7 |
| Vitamin D | 4.3 | 3.4 | 2.6–4.4 |
| Depo-Provera use | 1.3 | 1.8 | 1.2–2.7 |
| Down syndrome | 0.72 | 0.72 | 0.52–0.98 |
| Needs assistance with ambulation | 2.1 | 1.3 | 1.0–1.6 |
| History of fracture | 1.9 | 1.3 | 1.0–1.8 |
| Cooperative with exams | 1.0 | 0.70 | 0.56–0.87 |
| Interpersonal characteristic | |||
| Received a flu shot during the time period studied | 2.2 | 1.4 | 1.1–1.8 |
| Organizational characteristic | |||
| 24-hour supported residential setting | 1.8 | 1.3 | 1.1–1.7 |
CI, confidence interval; OR, odds ratio.