[Birth defects incidence in children from single and twin pregnancies in the Czech Republic--current data]
1Oddelení lékarské genetiky, Fakultní Thomayerova nemocnice, Praha. registrvvv@vrozene-vady.cz
Insights
Birth defect incidence is higher in twins compared to singletons, with statistically significant differences observed in nervous system, circulatory, digestive, and urinary systems. Specific conditions like congenital heart defects and Down syndrome also showed increased rates in twins.
Area of Science:
- Epidemiology
- Public Health
- Medical Genetics
Context:
- Birth defects represent a significant global health concern.
- Understanding variations in incidence based on pregnancy type is crucial for targeted interventions.
- The Czech National Birth Defects Register provides a valuable dataset for epidemiological studies.
Purpose:
- To analyze and compare the incidence of birth defects in single and twin pregnancies in the Czech Republic between 1994 and 2007.
- To assess the prevalence of specific birth defect groups (ICD-10 classification) in relation to pregnancy multiplicity.
- To identify statistically significant differences in birth defect rates between singletons and twins.
Summary:
- A retrospective analysis of over 1.3 million singleton and 42,000 twin births revealed a higher overall incidence of birth defects in twins (598.38/10,000) compared to singletons (436.03/10,000).
- Significant increases in twins were noted for nervous system, circulatory, digestive, and urinary system defects.
- Specific conditions including congenital heart defects, cleft lip/palate, and certain chromosomal abnormalities showed statistically significant higher rates in twin births.
Impact:
- The findings highlight a higher risk of birth defects in twin pregnancies, necessitating focused prenatal care and monitoring.
- Identifies specific defect categories requiring greater attention in twin pregnancies.
- Provides data to inform public health strategies and resource allocation for high-risk pregnancies.
Aim Of Study:
An analysis of occurrence of birth defects in children from single and twin pregnancies in the Czech Republic in 1994-2007. An assessment of total numbers and relative incidences of birth defects in births according to Tenth Revision of International Classification of Diseases (ICD-10).
Type Of Study:
Retrospective epidemiological analysis of birth defects incidences from the Czech National Birth Defects Register database.
Material And Methods:
Data from the National Birth Defects Register (Institute for Health Information and Statistics) in the Czech Republic in the 1994-2007 period were used. In this study, particular diagnoses--as they were registered in the National Register--were analyzed. Birth defects were analyzed separetely for children from single and twin pregnancies. The diagoses in study were divided into following eleven birth defects groups according to ICD-10 classification: (Q00-Q07) nervous system, (Q10-Q18) eye, ear, face and neck, (Q20-Q28) circulatory system, (Q30-Q34) respiratory system, (Q35-Q37) cleft lip and cleft palate, (Q38-Q45) digestive system, (Q50-Q56) genital organs, (Q60-Q64) urinary system, (Q65-Q79) musculoskeletal system, (Q80-Q89) other defects and (Q90-Q99) chromosomal abnormalities, not elsewhere classified. Total numbers and mean incidences of birth defects separetely for children from single and twin pregnancies were assessed for all these 11 groups.
Results:
In the Czech Republic during 1994-2007 period, totally 1,312,930 children were born (live births and stillbirts) from single pregnancies, whereas 42,448 from twin pregnancies. A twin rate (out of a total number of births) increased from 2.33% in 1997 to 4.17% in 2004. An overall incidence of diagnosed birth defects was 436.03 per 10,000 live births in singletons and 598.38 in twins. Birth defects incidence (per 10,000 livebirths)in singletons and twins in each of 11 birth defects groups under the study was during the 1994-2007 period as follows: (Q00-Q07) nervous system 9.45 in sigletons and 17.20 in twins, (Q10-Q18) eye, ear, face and neck 21.69 in singletons, and 18.38 in twins, (Q20-Q28) circulatory system 154.16 in singletons and 272.57 in twins, (Q30-Q34) respiratory system 4.92 in singletons and 5.65 in twins, (Q35-Q37) cleft lip and cleft palate 16.79 in singletons and 20.02 in twins, (Q38-Q45) digestive system 18.97 in singletons and 28.74 in twins, (Q50-Q56) genital organs 52.07 in singletons and 56.30 in twins, (Q60-Q64) urinary system 34.21 in singletons and 56.78 in twins, (Q65-Q79) musculoskeletal system 87.49 in singletons and 90.93 in twins, (Q80-Q89) other defects 26.06 in singletons and 22.14 in twins and (Q90-Q99) chromosomal abnormalities 10.20 in singletons and 9.66 in twins.
Conclusions:
The study gives differentiated results of incidences of selected types of birth defects in births according to pregnancy multiplicity. A statistically significant difference (p<0.001) in total birth defects incidence in twins compared to singletons was confirmed. Same statistical significance (p<0.001) was also found (twins compared to singletons) in following birth defects or their groups: (Q00-Q07) nervous system, Q20-Q28) circulatory system, (Q38-Q45) digestive system, (Q60-Q64) urinary system, congenital hydrocephalus, some congenital heart defects, cleft lip and/or palateoesophageal atresia, anorectal malformation, hypospadia, congenital hydronefrosis, polydactyly and syndactyly. A statistically significant difference (p<0.01) was found in spina bifida, hypoplastic left heart syndrome, duodenal atresia/stenosis, diaphragmatic hernia and Down syndrome.
Related Concept Videos
Nondisjunction
Nondisjunction
Teratogenicity
Probability Laws
Prevalence and Incidence
Prevalence indicates the proportion of individuals in a population who have a specific disease or health condition at a...
Meiosis vs. Mitosis
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

