Table 1.

Distribution of the cohort by year of birth, sex, average age at the beginning of exposure, and average duration of exposure.

Birth cohorts (no.)		Average age at the beginning of exposure in years (range)		Average exposure duration in years (range)
Male	Female	Male	Female	Male	Female
1911–30 (117)	-	28 (13–53)	-	25 (1–56)	–
1931–50 (801)	31–50 (15)	24 (15–53)	18 (0–40)*	26 (2–57)	19 (5–30)
1951–70 (436)	51–70 (14)	21 (0–45)*	9 (0–28)*	25 (1–49)	18 (6–34)
1971–82 (21)	71–82 (1)	23 (18–35)	0 (0–0)	11 (4–31)	19 (19–19)
Total (1,375)	Total (30)	24 (0–53)*	13 (0–40)*	25 (1–57)	18 (5–34)
Total 1,405

^*Refers to environmental or family exposures from birth.