Table 2

Age–sex adjusted COPD incidence rates by baseline factors

Baseline variables	Level	All eligible patients	COPD incidence (GP diagnosed)		COPD incidence (hospital admission)
Baseline variables	Level	N	n	Age–sex adjusted (%)	n	Age–sex adjusted (%)
All	–	812 063	16 034	1.92	2910	0.35
Sex	Male	392 574	8382	2.18	1435	0.38
	Female	419 489	7652	1.84	1475	0.36
Age (years)	40–49	241 580	1144	0.47	157	0.07
	50–59	224 817	3472	1.55	400	0.18
	60–69	159 628	4846	3.04	728	0.46
	70–79	119 832	4728	3.95	965	0.81
	80–89	66 206	1844	2.80	660	1.01
Smoking	Non	381 579	2781	0.75	450	0.12
	Ex (unknown)	72 646	1390	1.43	265	0.26
	Ex (1–19 cigarettes/day)	50 670	1906	3.39	334	0.60
	Ex (20–39 cigarettes/day)	23 896	1389	5.63	204	0.90
	Ex (40+ cigarettes/day)	4616	330	6.32	48	0.82
	Current (unknown)	17 048	268	1.28	60	0.26
	Current (1–19 cigarettes/day)	84 386	3449	4.87	685	1.10
	Current (20–39 cigarettes/day)	48 246	2572	7.07	471	1.69
	Current (40+ cigarettes/day)	4246	361	9.20	63	1.73
	Not recorded	124 730	1588	1.27	330	0.29
BMI (kg/m²)	<20	31 134	935	4.04	232	0.99
	≥20 and <25	262 208	5263	2.16	830	0.35
	≥25 and <30	236 394	4715	1.85	783	0.31
	≥30	105 469	2373	2.23	475	0.46
	Not recorded	176 858	2748	1.72	590	0.36
Practice Region	North	307 826	7270	2.39	1305	0.44
	South (excluding London)	414 539	7259	1.76	1313	0.32
	London	89 698	1505	1.86	292	0.37
IMD Decile	1 (most deprived)	44 037	1785	4.18	380	0.88
	=2	53 439	1640	3.19	323	0.62
	=3	67 133	1906	2.89	371	0.56
	=4	74 147	1726	2.36	354	0.48
	=5	79 579	1586	1.97	287	0.35
	=6	87 057	1648	1.92	293	0.35
	=7	92 102	1517	1.65	289	0.32
	=8	111 891	1737	1.57	251	0.23
	=9	94 877	1361	1.48	195	0.22
	=10 (least deprived)	106 870	1113	1.13	167	0.18

BMI, body mass index; COPD, chronic obstructive pulmonary disease; GP, general practitioner; IMD, Index of Multiple Deprivation.