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Table 5 Distribution of found and missed birth defects in the Lombardy Birth Defect Registry vs. birth certificates

From: Descriptive epidemiology of selected birth defects, areas of Lombardy, Italy, 1999

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