TABLE 2.

Contributing person-years according to age and sex of Danish cleft cases born in 1936 through 1998 and followed in the Danish Cancer Registry during 1968 through 1998

Age (years)	Men (person-years)	Women (person-years)	Total (person-years)
0–9	25,632	16,743	42,375
10–19	25,529	16,234	41,764
20–29	23,974	15,307	39,282
30–39	17,761	11,844	29,605
40–49	9,769	6,870	16,639
50–59	3,460	2,520	5,981
60–69	127	86	213
Total	106,256	69,607	175,863