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Incidence rate of first admission to hospital or death related to COPD (COPD event incidence) during 38 years of follow-up in a) nonobstructive and b) obstructive men based on N2-slope quintiles and number of reported symptoms. Number of subjects reporting symptoms among nonobstructive subjects were: 0 n=232, 1–2 n=168, 3–4 n=68, 5–6 n=36, 7–12 n=28. The corresponding numbers among obstructive subjects were: 0 n=22, 1–2 n=19, 3–4 n=16, 5–6 n=10, 7–12 n=20.
