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Table 3 RR for asthma hospitalization in childhood according to gestational age and estimated fetal growth

From: Birth weight, gestational age, fetal growth and childhood asthma hospitalization

Fetal development variables Cases Cumulative incidence (%) Crude RR Adjusted RR* (95% CI)
22-28 weeks     
  SGA 180 9.09 1.14 1.02 (0.86-1.21)
  AGA 527 7.96 1 1 (ref)
  LGA 30 5.43 0.71 0.71 (0.46-1.11)
Z-score per decreased of SD - - 1.04 1.02 (0.99-1.04)
29-32 weeks     
  SGA 359 6.15 1.20 1.07 (0.94-1.22)
  AGA 1,010 5.05 1 1 (ref)
  LGA 47 2.96 0.58 0.60 (0.43-0.85)
Z-score per decreased of SD - - 1.06 1.04 (1.02-1.07)
33-36 weeks     
  SGA 675 4.27 1.26 1.06 (0.97-1.17)
  AGA 5,409 3.43 1 1 (ref)
  LGA 387 3.41 0.99 0.94 (0.84-1.05)
Z-score per decreased of SD - - 1.05 1.03 (1.01-1.04)
37-38 weeks     
  SGA 860 3.56 1.22 1.15 (1.07-1.24)
  AGA 20,735 2.93 1 1 (ref)
  LGA 1,467 3.43 1.17 1.03 (0.97-1.09)
Z-score per decreased of SD - - 0.99 1.02 (1.01-1.03)
39-41 weeks     
  SGA 2,349 3.01 1.12 1.12 (1.07-1.17)
  AGA 85,611 2.71 1 1 (ref)
  LGA 3,095 3.06 1.13 1.06 (1.02-1.10)
Z-score per decreased of SD - - 0.99 1.02 (1.01-1.03)
42-45 weeks     
  SGA 455 2.51 1.07 1.11 (0.98-1.25)
  AGA 8,449 2.36 1 1 (ref)
  LGA 138 2.83 1.20 1.15 (0.95-1.40)
Z-score per decreased of SD - - 1.00 1.02 (0.99-1.05)
  1. *Adjusted for country of residence, maternal age at delivery, maternal social status, parity, mode of delivery, sex of the child, calendar year of birth and family history of asthma.