Table 1.
Congenital Malformation Diagnoses in Maternal and Infant Records from Different Registries Applying Different Restrictions to Types of Diagnoses. Each Infant/Fetus Was Only Represented Once per Register or Definition
| Livebirth | Non-Livebirth | TOPFA | All | |
|---|---|---|---|---|
| Total infants/foetuses | 1,328,643 | 6898 | 5233 | 1,340,774 |
| Identification of cases with one or more congenital malformation records | ||||
| Data source | Any malformation records/Specified major malformations | |||
| Any/Specific | Any/Specific | Any/Specific | Any/Specific (%) | |
| Birth registera | 85,204/55,336 | 408/365 | 85,612/55,701 (4.2) | |
| Main register | 85,163/55,305 | n<5* | 85,166/55,308 | |
| Primary/secondary diagnoses | 71,470/44,299 | n<5 | 71,473/44,302 | |
| Homebirth forms | 99/70 | n<5 | 100/70 | |
| Stillbirth forms | 404/362 | 404/362 | ||
| Cause of Death registerb | 1730/1704 | n<5 | 1732/1706 (0.1) | |
| Patient register (child)b,e | 161,701/101,997 | 11/8 | 161,712/102,005 (7.6) | |
| Tentative diagnoses | 30,858/19,148 | n<5 | 30,859/19,149 | |
| Primary/secondary diagnoses | 112,960/61,846 | 10/7 | 112,970/61,853 | |
| + hip malformations with two or more records | 103,650/58,363 | 10/7 | 103,660/58,370 | |
| + hip malformations present after 6 weeks postpartum | 108,441/59,071 | 10/7 | 108,451/59,078 | |
| + by specialist doctorc | 70,186/44,594 | 7/6 | 70,193/44,600 | |
| + by specialist doctorc & hip malformations present after 6 weeks postpartum | 68,447/43,192 | 7/6 | 68,454/43,198 | |
| Patient register (mother) | 7548/7163 | 296/285 | 4927/4782 | 12,771/12,230 |
| Includedd | 296/285 | 4927/4782 | 5223/5067 (0.4) | |
| Abortion register | n<5 | 5233/5055 | 5234/5056 (0.4) | |
| All unrestricted sources combined | 162,028/102,373 | 608/565 | 5233/5075 | 167,869/108,013 (8.1) |
| Prenatal records | 296/285 | 5233/5075 | 5529/5360 (0.4) | |
| Postpartum records | 162,028/102,373 | 417/371 | 162,445/102,744 (7.7) | |
Notes: *According to Danish confidentiality laws, reporting specific counts below five is not allowed. aOne-year follow-up in the Birth register. bLivebirths were followed for up to five years. cSpecialist doctors included pediatricians and obstetricians (specialist code 80 and 38). dMaternal records during pregnancy were disregarded for livebirths. eData on timing and specialist doctor were only available in the Patient register.