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Table 1 Risk factors for hospitalization over longitudinal follow-up: demographic characteristics and smoking
| Risk factor | Baseline interview (mean [SD] or n [%]) | Risk of hospitalization at 18 months (OR [95% CI]) |
|---|---|---|
| Age (per 10 years) | 40.5 (7.3) | 1.0 (0.6–1.7) |
| Female gender | 177 (73%) | 1.1 (0.5–2.4) |
| Non-white race/ethnicity | 71 (29%) | 2.1 (1.1–4.0) |
| Education (years) | 14.9 (2.5) | 0.8 (0.70–0.96) |
| Household income* | 45,000 | 1.3 (1.1–1.5) |
| Married or cohabitating | 160 (66%) | 1.0 (0.5–2.1) |
| Current cigarette smoking | 18 (7%) | 2.1 (0.7–6.4) |
| Past cigarette smoking | 87 (36%) | 1.3 (0.6–2.6) |
