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Revised intrauterine growth curves for an Australian hospital population
Insights
Updated intrauterine growth charts show higher infant weight percentiles compared to previous data. These charts are essential for monitoring fetal development and require regular revision due to evolving obstetric care and population factors.
Area of Science:
- Obstetrics and Gynecology
- Perinatology
- Pediatric Growth Monitoring
Background:
- Intrauterine growth curves necessitate periodic updates.
- Changes in population demographics, socio-economic status, and obstetric technology impact fetal growth.
- Existing growth charts may not accurately reflect current obstetric populations.
Purpose of the Study:
- To develop revised intrauterine growth curves.
- To compare current growth data with historical benchmarks.
- To identify factors influencing fetal growth.
Main Methods:
- Utilized anthropometric measurements from 3120 livebirths at the Royal Women's Hospital (1977-1979).
- Incorporated data for preterm infants (<35 weeks gestation) and data from earlier publications (<30 weeks gestation).
- Included infants with early ultrasonic assessment or clinically confirmed gestational age.
Main Results:
- Developed new intrauterine growth curves for gestational ages 24-42 weeks.
- Observed a general elevation in all centiles compared to 1966 data.
- Noted a significant elevation in the 10th weight centile after 37 weeks gestation.
Conclusions:
- Revised intrauterine growth charts reflect current obstetric populations.
- Infant sex, ethnic origin, and maternal factors (height, weight) are crucial for accurate growth assessment.
- Regular revision of growth charts is vital for effective clinical practice.
Abstract:
Intrauterine growth curves require periodic revision because of changes in population, socio-economic factors and technology used in obstetric care. Anthropometric measurements were derived from consecutive livebirths in the Royal Women's Hospital in 1979 and all those born before 35 weeks in 1977 and 1978; at gestational ages less than 30 weeks, data previously published was also incorporated. Infants were included if an ultrasonic examination of the uterus had been performed in the first 20 weeks of pregnancy or gestation based on "certain" menstrual history was confirmed clinically. From data on 3120 infants, intrauterine growth curves from 24-42 weeks' gestation were prepared; compared with births in the same hospital in 1966, there was generally an elevation of all centiles, particularly so for the 10th centile for weight after 37 weeks' gestation. Factors in the infant such as sex and ethnic origin and also maternal factors, especially pregnancy weight and height should be considered when using standard intrauterine growth charts.