TABLE 3

Associations between hormonal contraceptive (HC) use and middle-aged current asthma

Variable	Middle-aged current asthma^#		p-value
Variable	% (n/N)	OR (95% CI)	p-value
HC use
Never	9.2 (10/109)	1.0
Past	12.3 (256/2089)	1.36 (0.68–2.74)	0.39
Current	15.1 (83/551)	1.58 (0.76–3.29)	0.22
Duration of HC use
Nil	9.2 (10/109)	1.0
0.1–5 years	16.6 (97/583)	1.98 (0.96–4.09)	0.06
5.1–10 years	10.0 (66/660)	1.11 (0.53–2.31)	0.78
10.1–15 years	12.1 (62/513)	1.35 (0.64–2.83)	0.43
15.1–20 years	13.4 (61/455)	1.45 (0.69–3.05)	0.33
20.1–25 years	12.5 (40/320)	1.24 (0.57–2.71)	0.58
25.1–30 years	12.7 (14/110)	1.19 (0.47–3.03)	0.71
Per year of use of HCs		0.99 (0.97–1.01)	0.23
Age at start of HC use
Never	9.2 (10/109)	1.0
12–16 years	14.73 (105/713)	1.58 (0.77–3.25)	0.22
17–18 years	12.20 (131/1074)	1.37 (0.67–2.79)	0.39
19–42 years	12.13 (102/841)	1.35 (0.65–2.78)	0.42

^#: adjusted for maternal atopy, current smoking status and social class.