Table 1. Years of birth of 1186 NF1 patients in groups 1 and 2.

Year of birth	All patients	Group 1	Group 2
1900–1909	4	3	1
1910–1919	5	5	0
1920–1929	19	16	3
1930–1939	32	28	4
1940–1949	69	62	7
1950–1959	143	125	18
1960–1969	181	159	22
1970–1979	204	172	32
1980–1989	231	199	32
1990–1999	213	184	29
2000+	85	70	15
Total	1186	1023	163