Table 1– Age- and sex-specific rates of first-time chronic obstructive pulmonary disease (COPD) hospitalisations in Denmark during 2002–2008; main case definition

Age years	Females				Males
	First-time COPD hospitalisations n	Risk time^#	Incidence rate¶	95% CI	First-time COPD hospitalisations n	Risk time^#	Incidence¶	95% CI
30–39	293	2 735 642	0.11	0.09–0.12	222	2 811 255	0.08	0.07–0.09
40–49	1107	2 667 380	0.41	0.39–0.44	860	2 744 868	0.31	0.29–0.33
50–59	2936	2 572 971	1.14	1.10–1.18	2486	2 602 275	0.95	0.92–0.99
60–69	6059	1 982 296	3.06	2.98–3.13	5180	1 915 141	2.70	2.63–2.78
70–79	9201	1 325 121	6.94	6.80–7.08	8255	1 068 412	7.73	7.56–7.89
80–89	5824	807 149	7.16	6.98–7.35	5236	443 690	11.80	11.48–12.12
≥90	790	178 549	4.42	4.12–4.73	510	56 593	9.01	8.23–9.79
Total	26 210	12 274 932	2.14	2.11–2.16	22 749	11 642 234	1.95	1.93–1.98

^#: person years at risk of first-time COPD hospitalisation;
^¶: per 1000 person years.