Prevalence of gallstone disease in first-degree relatives of patients with cholelithiasis

Table 2 Prevalence of GD and levels of the most important risk factors for gallstones in fathers and mothers of subjects with or without gallstones

	Fathers of		Mothers of
	Cases	Controls	Cases	Controls
	n = 31	n = 34	n = 51	n = 51
Age (yr); mean (CI)	70.0 (66.7-73.4)	70.9 (67.6-74.2)	72.4 (69.2-75.5)	71.8 (71.8-74.8)
BMI; mean (CI)	25.7 (24.4-27.0)	27.5 (26.3-28.6)	26.3 (25.1-27.6)	26.3 (25.4-27.3)
Diabetes (%)	3.4a	20.6	20.0	21.2
Number. of pregnancies; mean (CI	-	-	2.9 (2.4-3.4)	2.9 (2.5-3.4)
GD (%)	41.9c	17.6	56.9b	21.6

^aP<0.05 vs controls (χ² = 4.15);

^cP<0.05 vs controls (χ² = 4.66; RR = 1.75 (0.98-2.6 95% CI);

^bP<0.001 vs controls (χ² = 13.32; RR = 2.35 (1.38-4.3 95% CI).