Table 3.

Second-hand smoke (SHS) exposure in ECRHS I-II, ECRHS II-III and ECRHS I-III^a

	Changes between ECRHS I and II	Changes between ECRHS II and III	Changes between ECRHS I and III
No SHS exposure at both examinations	54.4 (1639/3011)	74.5 (2243/3011)	58.9 (1774/3011)
No SHS exposure at first examination but at second examination	6.9 (208/3011)	2.5 (74/3011)	2.4 (73/3011)
SHS exposure at first examination but not at second examination	22.5 (678/3011)	18.4 (553/3011)	33.9 (1022/3011)
SHS exposure at both examinations	16.1 (486/3011)	4.7 (141/3011)	4.7 (142/3011)

^apresented as % (n/N)