Table 4—

Development of asthma or respiratory symptoms with independent variables: sex, age, changes in smoking habits, and pack-yrs, during 11‐yrs follow-up

	Asthma	Morning cough	Daytime cough	Chronic cough	Phlegm cough	Dysproea grade 1	Dysproea grade 2	Dysproea grade 3	Dysproea grade 4	Attacks of dyspnoea	Wheezing
Sex
Females (compared to males)	1.1 (0.7–1.7)	1.3 (1.0–1.7)	1.1 (0.8–1.4)	1.3 (1.0–1.7)	0.9 (0.7–1.1)	1.9 (1.5–2.4)	2.3 (1.7–3.1)	2.0 (1.7–3.1)	2.4 (1.3–4.4)	15 (1.1–2.0)	1.4 (1.1–1.7)
Age in 1985 (compared to 15–29) yrs
30–49	1.2 (0.7–2.0)	1.3 (1.0–1.8)	1.3 (0.9–1.8)	1.2 (0.8–1.6)	0.9 (0.7–1.2)	0.8 (0.6–1.1)	0.8 (0.6–1.1)	1.4 (0.8–2.4)	1.0 (0.5–2.1)	0.7 (0.5–0.9)	0.8 (0.6–1.0)
50–70	2.0 (1.1–3.6)	1.9 (1.4–2.7)	1.7 (1.2–2.0)	1.4 (0.9–2.0)	1.4 (1.0–2.0)	2.0 (1.4–2.7)	2.1 (1.5–3.0)	2.9 (1.7–5.1)	1.6 (0.8–3.3)	0.9 (0.6–1.3)	0.7 (0.5–0.9)
Changes in smoking habits (compared to never-to-never)
Non-to-current	1.1 (0.4–3.2)	1.9 (1.1–3.2)	2.0 (1.1–3.4)	2.3 (1.3–4.0)	2.2 (1.4–3.7)	1.2 (0.7–2.2)	0.9 (0.5–1.8)	0.6 (0.2–1.9)	1.2 (0.3–4.3)	1.4 (0.7–2.7)	2.3 (1.5–3.6)
Current-to-current	1.0 (0.5–2.0)	1.8 (1.2–2.6)	1.5 (1.0–2.2)	1.4 (0.9–2.1)	2.0 (1.3–2.9)	1.5 (1.0–2.2)	0.8 (0.5–1.2)	0.7 (0.4–1.2)	0.7 (0.3–1.8)	1.7 (1.1–2.6)	2.0 (1.4–2.8)
Current-to-ex	1.2 (0.6–2.6)	1.0 (0.6–1.6)	0.8 (0.4–1.3)	0.6 (0.3–1.1)	1.1 (0.7–1.8)	1.3 (0.8–2.0)	1.1 (0.7–1.7)	1.1 (0.6–2.2)	1.2 (0.5–3.2)	1.6 (1.0–2.6)	1.4 (1.0–2.1)
Ex-to-ex	0.9 (0.5–1.8)	0.7 (0.5–1.1)	0.4 (0.2–0.7)	0.6 (0.3–0.9)	0.9 (0.6–1.3)	1.1 (0.8–1.6)	0.9 (0.6–1.4)	0.7 (0.4–1.4)	1.1 (0.5–2.5)	1.3 (0.8–2.0)	1.1 (0.8–1.5)
Pack-yrs
Per 10 pack-yrs increase	1.2 (1.0–1.4)	1.2 (1.0–1.3)	1.2 (1.1–1.4)	1.3 (1.1–1.5)	1.1 (0.9–1.2)	1.1 (1.0–1.2)	1.3 (1.1–1.4)	1.4 (1.2–1.6)	1.1 (0.9–1.5)	1.1 (1.0–1.3)	1.1 (1.0–1.3)

Data are presented as adjusted odds ratio (95% confidence intervals)