Table 3.

Odds ratios and 95% confidence interval of association between mode of delivery and (i) filled prescriptions of asthma medication at age 9–12 years^¶ and (ii) asthma diagnosis, in a cohort of children born in Sweden in June 1993–June 1999

	Mode of delivery	Model A* (n = 175 110)	Model B† (n = 174 381)	Model C‡ (n = 139 610)
Any asthma medication	Vaginal	Ref	Ref	Ref
Vaginal, instrumental	1.08 (1.01–1.16)	1.09 (1.02–1.17)	1.03 (0.95–1.12)
Caesarean, emergency	1.19 (1.10–1.29)	1.17 (1.08–1.27)	1.14 (1.04–1.25)
Caesarean, elective	1.18 (1.08–1.29)	1.09 (0.99–1.19)	1.06 (0.95–1.18)
β2-Agonists, corticosteroids or montelucast, at least twice	Vaginal	Ref	Ref	Ref
Vaginal, instrumental	1.05 (0.97–1.14)	1.06 (0.98–1.16)	1.02 (0.92–1.13)
Caesarean, emergency	1.18 (1.07–1.30)	1.17 (1.06–1.29)	1.16 (1.03–1.29)
Caesarean, elective	1.24 (1.11–1.38)	1.13 (1.01–1.27)	1.10 (0.97–1.26)
Asthma diagnosis during follow up year¶	Vaginal	Ref	Ref	Ref
Vaginal, instrumental	1.20 (1.05–1.37)	1.21 (1.06–1.38)	1.05 (0.91–1.23)
Caesarean, emergency	1.35 (1.16–1.57)	1.32 (1.14–1.54)	1.18 (1.00–1.34)
Caesarean, elective	1.33 (1.12–1.58)	1.17 (0.98–1.40)	1.25 (1.02–1.52)

^†Adjusted for gender.

^†Adjusted for gender, birth weight and gestational age.

^†Adjusted for gender, birth weight, gestational age, birth order, APGAR score, hypoxia/asphyxia, mother's age, smoking during pregnancy, mother living with father of the child, mother's birth country and mother's BMI.

^†13th year of life for children born June 1993–May 1996, 10th year of life for children born June 1996–June 1999.