Table 2.
Risk Factors for Any Type of Bronchiolitis Visit or Hospitalization* Among Term Infants Enrolled in Tennessee Medicaid, 1995-2003
| Characteristic | Any Visit HR ( 95% CI) |
Hospitalization HR ( 95% CI) |
|---|---|---|
| Birth Weight | ||
| 2500 to 3000 grams | 1 | 1 |
| 3001 to 3500 grams | 0.92 (0.89-0.96) | 0.86 (0.81-0.92) |
| 3501 to 4000 grams | 0.90 (0.86-0.94) | 0.80 (0.75-0.87) |
| 4001 to 4500 grams | 0.80 (0.75-0.85) | 0.76 (0.67-0.86) |
| 4501 to 5000 grams | 0.72 (0.61-0.83) | 0.57 (0.41-0.78) |
| Maternal Age† | ||
| 15-19 | 1.05 (1.01-1.09) | 1.15 (1.06-1.23) |
| 20-29 | 1 | 1 |
| 30-39 | 0.76 (0.72-0.79) | 0.66 (0.60-0.73) |
| 40-44 | 0.54 (0.43-0.68) | 0.43 (0.26-0.69) |
| Infant Sex | ||
| Female | 1 | 1 |
| Male | 1.35 (1.31-1.39) | 1.33 (1.26-1.41) |
| Infant Race | ||
| White | 1 | 1 |
| African-American | 0.73 (0.70-0.76) | 0.66 (0.61-0.71) |
| Latino | 0.88 (0.77-1.02) | 0.87 (0.67-1.13) |
| Maternal Education | ||
| <12 Years | 1.03 (0.99-1.08) | 1.15 (1.04-1.26) |
| 12 Years | 1.01 (0.97-1.06) | 1.02 (0.93-1.11) |
| >12 Years | 1 | 1 |
| Maternal Asthma | ||
| No | 1 | 1 |
| Yes | 1.35 (1.28-1.41) | 1.45 (1.33-1.59) |
| Maternal Smoking‡ | ||
| Non-smoker | 1 | 1 |
| 1 - 9 cigarettes/day | 1.09 (1.03-1.15) | 1.14 (1.03-1.27) |
| ≥10 cigarettes/day | 1.17 (1.13-1.22) | 1.28 (1.20-1.36) |
| Number of Siblings | ||
| 0 | 1 | 1 |
| 1 | 1.21 (1.17-1.26) | 1.38 (1.29-1.49) |
| ≥ 2 | 1.31 (1.25-1.36) | 1.64 (1.51-1.78) |
| Residence | ||
| Urban | 1 | 1 |
| Suburban | 1.17 (1.12-1.21) | 1.28 (1.18-1.39) |
| Rural | 1.23 (1.19-1.28) | 1.87 (1.74-2.02) |
*
Includes 23 hour observations
†
maternal age at delivery
‡
maternal smoking during pregnancy