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Screening for intrauterine growth retardation using ratio of mid-arm circumference to occipitofrontal circumference
Insights
Standard weight charts may overestimate intrauterine growth retardation in diverse infants. A mid-arm to occipitofrontal circumference ratio offers a more accurate assessment across ethnic groups, independent of birth weight variations.
Area of Science:
- Neonatalogy
- Pediatric Growth Assessment
- Anthropometry
Background:
- Standard birth weight percentile charts, often derived from specific ethnic populations, may inaccurately assess growth in diverse infant populations.
- Overestimation of intrauterine growth retardation (IUGR) can occur when applying universal charts to multiethnic groups.
- Accurate assessment of IUGR is crucial for timely intervention and improved infant outcomes.
Purpose of the Study:
- To evaluate the utility of the mid-arm circumference to occipitofrontal circumference (MAC/OFC) ratio as a reliable indicator of intrauterine growth retardation (IUGR) across different ethnic groups.
- To determine if the MAC/OFC ratio is a more accurate predictor of IUGR symptoms than birth weight alone, particularly in multiethnic neonates.
- To establish a simple, accurate, and cost-effective anthropometric method for assessing IUGR in diverse populations.
Main Methods:
- A cross-sectional study involving 194 neonates (49 Asian, 58 black, 87 white) to compare the MAC/OFC ratio across ethnic groups and sexes.
- A prospective study of 64 neonates identified as below the 10th percentile on standard weight charts.
- Analysis of the MAC/OFC ratio's correlation with the development of symptoms associated with intrauterine growth retardation.
Main Results:
- The MAC/OFC ratio demonstrated consistency across Asian, black, and white infants, unlike birth weight, and was independent of infant sex.
- In neonates with low birth weight percentile, the MAC/OFC ratio proved to be a more sensitive predictor of subsequent IUGR symptoms compared to birth weight.
- The MAC/OFC ratio showed potential as a reliable growth assessment tool in multiethnic settings.
Conclusions:
- The MAC/OFC ratio is a valuable anthropometric measurement for assessing intrauterine growth retardation, showing ethnic independence.
- This ratio offers a more accurate and reliable method than standard birth weight charts for identifying IUGR in multiethnic infant populations.
- The MAC/OFC ratio presents a simple, accurate, and economical approach to IUGR assessment, particularly beneficial in diverse geographical areas.
Abstract:
Uncritical application of standard weight percentile charts, derived from white infants, to infants from different ethnic groups may result in an overestimate of the incidence of intrauterine growth retardation in those groups. The ratio of mid-arm circumference to occipitofrontal circumference was studied in 194 babies (49 Asian, 58 black, and 87 white). In contrast with birth weight the ratio did not vary among the ethnic groups; it was also independent of sex. In a prospective study of 64 neonates whose weight was below the 10th percentile on standard charts the ratio of mid-arm circumference to occipitofrontal circumference was a more accurate predictor than weight of those infants who would develop symptoms associated with intrauterine growth retardation. The ratio of mid-arm circumference to occipitofrontal circumference therefore provides a simple, accurate, and cheap way of assessing intrauterine growth retardation in areas with a large multiethnic population, where birth weight varies greatly.