Table 5.

Distribution of found and missed birth defects in the Lombardy Birth Defect Registry vs. birth certificates

	Birth defects identified by Registry
Birth defects identified by birth certificates	Yes	No	Totals
Yes	23	2	25
No	375	31*	406
Totals	398	33	431*

* The number of cases missed by both sources (31) and the total number of birth defects (431) were estimated by the capture-recapture method.