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A comparison of five anthropometric indices for identifying factors of malnutrition
Insights
Weight-for-age and height-for-age indices best identify long-term nutritional status factors in children. Weight velocity effectively tracks short-term nutritional changes, while height velocity shows delayed effects.
Area of Science:
- Pediatric Nutrition
- Anthropometry
- Public Health Research
Background:
- Nutritional status assessment in children is crucial for early intervention.
- Various anthropometric indices exist, but their effectiveness in identifying different temporal factors of malnutrition varies.
- Understanding these differences is key to accurate nutritional surveillance.
Purpose of the Study:
- To compare five anthropometric indices for their ability to identify nutritional status factors in children.
- To assess the influence of long-term (socioeconomic status), medium-term (famine), and short-term (season) factors on these indices.
- To determine the relative power of each index in reflecting nutritional status changes over different time scales.
Main Methods:
- Longitudinal study of approximately 1,400 children (12-60 months) in Matlab, Bangladesh.
- Collection of weight and height data at 11 two-month intervals.
- Analysis using regression to assess socioeconomic status, famine, and seasonal impacts on anthropometric indices.
Main Results:
- Weight-for-age and height-for-age indices are most effective for identifying long- and medium-term nutritional factors.
- Weight velocity is best for identifying short-term nutritional factors.
- Height velocity identifies only short-term factors, with a four-month lag compared to weight velocity.
Conclusions:
- The choice of anthropometric index is critical for identifying specific nutritional status factors (long, medium, or short-term).
- Weight-for-age and height-for-age are robust indicators for chronic malnutrition.
- Weight velocity offers timely detection of acute nutritional stress.
Abstract:
Five anthropometric indices--weight-for-age, height-for-age, weight-for-height, weight velocity, and height velocity--are compared for identifying factors of nutritional status of children. Data come from Matlab, the field station of the International Centre for Diarrhoeal Disease Research, Bangladesh. Weights and heights on approximately 1,400 children aged 12-60 months were taken 11 times at two-month intervals. Dwelling floor space, a proxy for socioeconomic status, is considered a long-term factor; the 1974-1975 Bangladesh famine, a medium-term factor; and season, a short-term factor of nutritional status. The figures of the indices by socioeconomic status at different times show their power to identify the factors visually; the regression analyses test statistical significance of the factors; and the standardized regression coefficients provide relative power of the indices to identify the factors. Weight-for-age and height-for-age appear best for identifying long- and medium-term factors; weight velocity, for identifying short-term factors. Weight-for-height is third in identifying long- and medium-term factors, second for identifying short-term factors. Height velocity identifies short-term factors only. The effect of short-term factors on height velocity appears approximately four months later than it appears on weight velocity. This study clarifies why certain indices do not predict mortality in this study population and others.