Table 2.

Distribution of responders with first or second degree relatives according to diagnostic age of affected person (<50, >50 and both ages <50 and >50 years)

Family history	FDR(n = 134)			SDR(n = 207)
	n	%	95%CI	n	P	95%CI
FH of UGI
≥1 affected relatives at age <50 years	27	20.1	13.3-26.9	13	6.3	3-9.6
≥1 affected relatives at age >50 years	86	64.2	56.1-72.3	150	72.5	66.4-78.6
≥1 affected relatives at both ages, <50 and >50 years	8	6.0	2-10	12	5.8	2.6-9
Unknown diagnostic age	13	9.7	4.7-14.7	32	15.4	10.5-20.3