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.
From: Incidence of asthma and mortality in a cohort of young adults: a 7-year prospective study
|  | 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 | Â | Â | Â | Â |
Men | 1720 | 12 | 13040 | 9.20 (5.23–16.20) |
Women | 1834 | 29 | 13841 | 20.95 (14.56–30.15) |
Birth Cohort | Â | Â | Â | Â |
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) |