TABLE 4.

Incidence rate of chronic cough in all eligible participants

Baseline characteristics	At risk n	Incident chronic cough n	Total follow-up years	Incidence rate per 1000 person-years (95% CI)	Incidence rate ratio (95% CI)
Total participants n	8751	439	52 817	8.3 (7.6–9.1)
Sex
Male	5086	249	31 136	8.0 (7.0–9.1)	Ref.
Female	3665	190	21 681	8.8 (7.6–10.1)	1.09 (0.90–1.33)
Age ≥70 years
No	4546	318	33 157	11.9 (10.6–13.2)	Ref.
Yes	1699	121	19 660	11.1 (9.2–13.2)	0.64 (0.52–0.79)
Smoking status
Never	2865	129	17 630	7.3 (6.1–8.7)	Ref.
Past	4440	216	26 736	8.1 (7.0–9.2)	1.10 (0.88–1.38)
Current	1440	94	8433	11.2 (9.0–13.6)	1.52 (1.16–2.00)
Current smokers
Female	857	41	5077	8.1 (5.8–11.0)	Ref.
Male	583	53	3355	15.8 (11.8–20.7)	1.96 (1.28–3.02)
Obesity
No	5939	299	36 036	8.3 (7.4–9.3)	Ref.
Yes	1874	120	11 496	10.4 (8.7–12.5)	1.26 (1.01–1.56)