Table 3 Associations between delivery by caesarean section and different respiratory outcomes and positive specific IgE at the age of 8 years
Total population(N = 2917)Non-allergic parents(N = 1495)Only one allergic parent(N = 1156)Two allergic parents(N = 266)
% (N)OR* (95% CI)% (N)OR* (95% CI)% (N)OR* (95% CI)% (N)OR* (95% CI)
Asthma
    Caesarean section
        Yes20.2 (50)1.79 (1.27 to 2.51)12.9 (16)1.36 (0.77 to 2.42)23.5 (23)1.86 (1.12 to 3.09)44.0 (11)2.91 (1.20 to 7.05)
        No11.7 (312)1.008.4 (115)1.0014.1 (149)1.0019.9 (48)1.00
Wheeze
    Caesarean section
        Yes8.1 (20)1.24 (0.76 to 2.04)4.8 (6)0.95 (0.39 to 2.31)9.2 (9)1.17 (0.56 to 2.43)20.0 (5)1.87 (0.59 to 5.88)
        No6.1 (162)1.004.0 (55)1.007.8 (82)1.0010.4 (25)1.00
Dyspnoea
    Caesarean section
        Yes13.4 (33)1.63 (1.09 to 2.43)9.7 (12)1.53 (0.79 to 2.93)15.3 (15)1.69 (0.93 to 3.08)24.0 (6)1.62 (0.58 to 4.49)
        No8.0 (213)1.005.6 (77)1.009.4 (99)1.0015.4 (37)1.00
Steroid prescription
    Caesarean section
        Yes9.7 (24)1.51 (0.95 to 2.39)4.8 (6)0.83 (0.35 to 2.02)11.2 (11)1.61 (0.82 to 3.18)28.0 (7)3.70 (1.29 to 10.61)
        No6.0 (160)1.004.5 (62)1.007.3 (77)1.008.7 (21)1.00
Any specific IgE
    Caesarean section
        Yes45.1 (55)1.17 (0.80 to 1.70)51.1 (23)2.14 (1.16 to 3.98)40.7 (24)0.89 (0.51 to 1.54)44.4 (8)0.62 (0.22 to 1.74)
        No40.5 (540)1.0033.3 (202)1.0044.4 (255)1.0054.6 (83)1.00
  • *Adjusted for gender, birth weight, breastfeeding, maternal education and maternal body mass index (and for parental allergy status in the analysis of the total study population).