Table 1 Socio-Demographic, pre-, neo-, and post- natal conditions of healthy and bronchiolitis hospitalized infants
From: Prenatal tobacco smoke exposure increases hospitalizations for bronchiolitis in infants
| Â | Â | Hospitalization for bronchiolitis | |
|---|---|---|---|
| Â | Total | No | Yes |
Socio demographic characteristics of parents | Â | Â | Â |
 Mother’s Age (y, mean ± SD) | 33.6 ± 5.3 | 33.6 ± 5.3 | 33.2 ± 5.5 |
 Parents’ Educational Level |  |  |  |
  Primary, N. (%) | 270 | 251 (12.0) | 19 (15.8) |
  High, N. (%) | 1521 | 1440 (68.9) | 81 (67.5) |
  Graduate, N. (%) | 419 | 399 (19.1) | 20 (16.7) |
Gestational age at birth | Â | Â | Â |
 Weeks |  |  |  |
  33–34, N. (%) | 737 | 683 (32.7) | 54 (45.0) |
  35–37, N. (%) | 767 | 726 (34.7) | 41 (34.2) |
   > 37, N. (%) | 706 | 681 (32.6) | 25 (20.8) |
Risk conditions | Â | Â | Â |
  Prenatal Risk | 2092 | 1974 (94.4) | 118 (98.3) |
  Neonatal Risk | 1945 | 1837 (87.9) | 108 (90.0) |
Environmental risk conditions | Â | Â | Â |
  Exposure to Epidemic Season | 1323 | 1234 (59.0) | 89 (74.2) |
  No breastfeeding | 482 | 440 (21.1) | 42 (35.0) |
  Presence of siblings | 900 | 820 (39.2) | 80 (66.7) |
  Crowded Living Conditions | 227 | 200 (9.6) | 27 (22.5) |
  Day Care Attendance | 357 | 331 (15.8) | 26 (21.7) |
Any smoke exposure | 1043 | 976 (46.7) | 67 (55.8) |
Total | 2210 | 2090 (94.6) | 120 (5.4) |