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

Table 3 Prevalence of GD and levels of the most important risk factors for gallstones in brothers and sisters of subjects with or without gallstones

	Brothers of		Sisters of
	Cases	Controls	Cases	Controls
	n = 50	n = 47	n = 39	n = 44
Age (yr); mean (CI)	48.5 (45.4-51.6)	44.9 (41.4-48.3)	43.9 (39.0-48.8)	48.9 (44.9-52.8)
BMI ; mean (CI)	25.6 (24.6-26.5)	25.5 (24.4-26.6)	24.8 (23.4-26.1)	25.8 (24.5-27.1)
Diabetes (%)	5.9	0	2.7	11.4
No. of pregnancies; mean (CI)	-	-	1.3 (0.9-1.7)	1.5 (1.0-1.9)
GD (%)	10.0	8.5	25.6a	9.1

^aP<0.05 vs controls (χ² = 4.04; RR = 2.03 [0.94-6.22 95%CI])