Table 1– Number of subjects grouped by age in the five populations included in this study

Sex	Population	Age years
Sex	Population	18–20	20–30	30–40	40–50	50–60	60–70	70–80	80–90	90–95
Females	AH	8	46	91	127	211	334	340	228	8
	JHH	29	90	119	187	320	517	486	217	2
	TLDRI	34	290	606	600	1412	1485	1029	205	2
	NHANES III	202	1080	925	792	590	779	579	404	19
	HSE	98	586	925	844	904	662	462	110	7
Males	AH	12	55	108	189	281	351	265	118	4
	JHH	26	122	150	253	437	622	479	195	7
	TLDRI	33	292	466	600	1360	1354	893	180	5
	NHANES III	236	1144	1117	844	668	745	657	409	40
	HSE	115	707	1068	1025	1049	719	506	165	9

AH: Austin Hospital, Victoria, Australia; JHH: John Hunter Hospital, New South Wales, Australia; TLDRI: National Research Institute of TB and Lung Diseases, Warsaw, Poland; NHANES III; National Health and Nutrition Examination Survey III; HSE: Health Survey for England 1995–1996.