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Table 3 Baseline demographic and clinical characteristic of the enrolled newborns and of their parents: postnatal conditions

From: Risk factors for bronchiolitis hospitalization during the first year of life in a multicenter Italian birth cohort

  wGA groups
  33+0d-34+6d (No. 737) 35+0d-37+6d (No. 767) ≥38+0d (No. 706) Total (No. 2210)
Presence of siblings     
  None 472 (64.0) 444 (57.9) 394 (55.8) 1310 (59.3)
  ≤ 10 year 223 (30.3) 289 (37.7) 280 (39.7) 792 (35.8)
  > 10 year 42 (5.7) 34 (4.4) 32 (4.5) 108 (4.9)
Residential crowding 88 (11.9) 86 (11.2) 53 (7.5) 227 (10.3)
Lack of breastfeeding 209 (28.4) 193 (25.2) 80 (11.3) 482 (21.8)
Pollution exposure 77 (10.4) 102 (13.3) 87 (12.3) 266 (12.0)
Exposure to parental smoking 310 (42.1) 320 (41.7) 272 (38.5) 902 (40.8)
Indoor humidity 75 (10.2) 75 (9.8) 72 (10.2) 222 (10)
Exposure to epidemic season 437 (59.3) 474 (61.8) 412 (58.4) 1323 (59.9)
Hospitalization for bronchiolitis 54 (7.3) 41 (5.3) 25 (3.5) 120 (5.4)
  1. All data are reported as No. (%); wGA = weeks of gestational age; yrs = years