Association of NOD1 (CARD4) insertion/deletion polymorphism with susceptibility to IBD: A meta-analysis

Table 3 Egger’s linear regression test to measure the funnel plot asymmetry¹

Comparisons	Y axle intercept: a (95%CI)
	GG vs T	GG/T + GG/GG vs T/T	GG/GG vs T/T + GG/T	GG/GG vs T/T	GG/T vs T/T
Overall	-1.92 (-5.57-1.72)	0.96 (-2.65-4.58)	2.38 (-0.87-5.64)	2.38 (-1.00-5.77)	2.32 (-0.71-5.36)
CD	-2.62 (-6.54-1.29)	1.60 (-2.38-5.59)	2.79 (-0.20-5.78)	2.89 (-0.31-6.09)	2.51 (-0.29-5.33)
UC	-0.39 (-6.54-5.75)	0.57 (-5.25-6.39)	-0.57 (-7.13-5.97)	-0.43 (-7.00-6.13)	-0.57 (-6.89-5.74)
IBD onset at < 40 yr of age	-2.16 (-8.80-4.47)	1.49 (-4.16-7.15)	1.86 (-4.04-7.77)	1.94 (-4.40-8.29)	1.63 (-3.48-6.75)

¹All P > 0.05. IBD: Inflammatory bowel disease; CD: Crohn’s disease; UC: Ulcerative colitis.