Table 1.

The incidence of birth defects of perinatal infants in Xi’an city from 2003 to 2012

Year	Hospital birth rate (%)	Live birth (n)	Perinatal infants (n)	Birth defects (n)	Birth defect rate (%)	Single deformity			Multiple deformities
						n	Incidence (%)	Proportion rate (%)	n	Incidence (%)	Proportion rate (%)
2003	92.46	35,575	42,272	388	9.18	307	7.26	79.12	81	1.92	20.88
2004	93.65	36,894	48,489	417	8.60	338	6.97	81.06	79	1.63	18.94
2005	94.45	36,423	54,827	417	7.61	338	6.16	81.06	79	1.44	18.94
2006	96.25	35,196	58,653	461	7.86	397	6.77	86.12	64	1.09	13.88
2007	96.46	38,122	80,530	596	7.40	500	6.21	83.89	96	1.19	16.11
2008	96.84	46,348	96,547	688	7.13	592	6.13	86.05	96	0.99	13.95
2009	98.99	49,712	98,921	824	8.33	690	6.98	83.74	134	1.35	16.26
2010	99.57	59,251	106,822	917	8.58	794	7.43	86.59	123	1.15	13.41
2011	99.57	61,158	113,974	910	7.98	788	6.91	86.59	122	1.07	13.41
2012	99.96	69,063	131,928	923	7.00	807	6.12	87.43	116	0.88	12.57
Total	97.12	467,742	832,963	6541	7.85	5551	6.67	84.86	990	1.19	15.14