Table 1

Response rates for ECRHS II and III in the target sample (those responding to ECRHS I)

Country	Centre	Target sample*	Responded ECRHS II†		Responded ECRHS II and ECRHS III†
Country	Centre	N	N	% of target sample	N	% of target sample	Mean follow-up (years)	% female	Mean age at ECRHS III
Iceland	Reykjavik	563	445	79.0	357	63.4	20.2	56.0	53.4
Norway	Bergen	835	658	78.8	505	60.5	19.0	49.5	50.9
Sweden	Umea	552	459	83.2	321	58.2	19.9	54.8	53.1
	Uppsala	622	513	82.5	387	62.2	19.9	53.0	52.7
	Gothenburg	682	548	80.4	414	60.7	19.9	56.0	52.6
Estonia	Tartu	431	352	81.7	229	53.1	18.2	58.5	49.4
Denmark	Aarhus	394	321	81.5	263	66.8	18.5	54.8	51.4
Belgium	Antwerp City	564	403	71.5	294	52.1	19.7	63.9	52.3
	Antwerp South	558	432	77.4	350	62.7	20.5	52.9	54.0
Germany	Hamburg	900	672	74.7	449	49.9	19.8	51.0	54.1
	Erfurt	715	548	76.6	453	63.4	18.9	50.3	52.6
Netherlands	Groningen	208	63	30.3	34	16.3	21.3	50.0	59.8
UK	Caerphilly	380	263	69.2	178	46.8	19.4	57.3	54.8
	Norwich	473	408	86.3	258	54.5	20.2	61.2	54.5
	Ipswich	448	389	86.8	234	52.2	19.9	56.4	54.3
Switzerland	Basel	852	513	60.2	306	35.9	19.0	50.7	52.0
France	Bordeaux	544	167	30.7	122	22.4	19.6	43.4	51.8
	Paris	651	493	75.7	388	59.6	20.3	55.4	55.7
	Grenoble	473	417	88.2	376	79.5	20.5	47.1	55.6
	Montpellier	456	285	62.5	177	38.8	19.3	53.1	56.1
Spain	Oviedo	357	310	86.8	175	49.0	18.7	51.4	53.1
	Galdakao	486	429	88.3	316	65.0	19.1	52.5	50.9
	Barcelona	392	314	80.1	205	52.3	18.8	59.5	51.5
	Albacete	435	393	90.3	223	51.3	19.5	54.7	51.8
	Huelva	271	223	82.3	133	49.1	18.9	58.6	51.5
Italy	Verona	342	254	74.3	150	43.9	16.3	47.3	49.9
	Pavia	310	288	92.9	156	50.3	20.1	50.6	55.0
	Turin	244	176	72.1	80	32.8	19.9	53.8	54.4
Australia	Melbourne	669	483	72.2	351	52.5	19.8	55.6	54.3
	Total	14 807	11 219	75.8	7884	53.2	19.5	53.8	53.0

*Target samples are responders to ECRHS I.
†Responders defined as subjects returning a questionnaire for ECRHS II or for ECRHS II and III.
ECRHS, European Community Respiratory Health Survey.