Table 1.

Number of subjects at risk at start of follow-up (1991/92), number of new cases of asthma, person-years, crude incidence (95% C.I.) during the period 1991–2000 according to sex and birth cohort.

	N° of subjects at risk	N° of new cases (1991–2000)	Person-years	Incidence*10,000
Total	3554	41	26881	15.25 (11.23–20.71)
Sex
Men	1720	12	13040	9.20 (5.23–16.20)
Women	1834	29	13841	20.95 (14.56–30.15)
Birth Cohort
1946–1951	793	6	5935	10.11 (4.54–22.50)
1951–1956	738	6	5634	10.65 (4.78–23.71)
1956–1961	710	9	5379	16.73 (8.70–32.15)
1961–1966	732	10	5543	18.04 (9.71–33.52)
1966–1971	581	10	4389	22.78 (12.26–42.34)