Table 1 . Yearly Prevalence of TOF at the Study Center .

Year	CHD (n)	CCHD (n)	TOF (n)	% of TOF in CHD	% of TOF in CCHD
2007	87	22	13	14.9	59.1
2008	119	29	10	8.4	34.5
2009	90	23	18	20	86.9
2010	103	36	12	11.6	33.3
2011	153	48	27	17.6	56.3
2012	143	47	26	18.2	55.3
2013	180	65	27	33.7	41.5
2014	108	41	12	11.1	29.3
Total	983	311	155	15.8	49.8

Abbreviations‏: CHD, congenital heart disease; CCHD, cyanotic congenital heart disease; TOF; tetralogy of Fallot.