Table 1. Incidence and RR of BA by sex and year in Korea, 2011–2015.

Variable	No. of BA patients	Incidence of BA per 10,000 live births	RR	P value
Sex
M	103	0.92	-	-
F	137	1.28	1.40	0.020
Year
2011	56	1.19	1.40	0.100
2012	57	0.97	1.43	0.090
2013	55	1.26	1.38	0.160
2014	42	0.96	1.05	0.830
2015	40	0.91	-	-
Total	240	1.06	-	-

BA = biliary atresia, RR = relative risk.