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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     
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)