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Effects of nutritional status on diarrhea in Peruvian children
William Checkley1, Robert H Gilman, Robert E Black
1Department of International Health, The Johns Hopkins School of Public Health, Baltimore, Md. 21205, USA.
Insights
Poor nutritional status in children under 3 years old significantly increases diarrhea incidence and duration. Infants and undernourished children are key targets for diarrhea prevention strategies.
Area of Science:
- Pediatric infectious diseases
- Global child health
- Nutritional epidemiology
Background:
- Diarrheal diseases remain a leading cause of mortality in children globally.
- Understanding the interplay between nutrition and diarrhea is crucial for effective public health interventions.
Purpose of the Study:
- To investigate the relationship between nutritional status and diarrhea incidence and duration.
- To identify high-risk groups for childhood diarrhea in a Peruvian peri-urban setting.
Main Methods:
- A 4-year prospective cohort study involving 230 children under 3 years old.
- Daily monitoring for diarrhea and monthly anthropometric measurements.
- Statistical modeling using multivariate time-to-event and mixed-effects gamma regression.
Main Results:
- An average incidence of 3.2 diarrheal episodes per child-year was observed.
- Decreased height-for-age z-scores were significantly associated with increased diarrhea frequency (15% per SD decrease).
- Diarrheal episodes were longer in infants (<6 months) compared to older children.
Conclusions:
- Children with poor nutritional status, particularly infants, are at higher risk for acute diarrhea.
- Targeted prevention efforts focusing on nutritional status are essential to reduce the burden of childhood diarrhea.
Objectives:
We conducted a 4-year (1995-1998) field study in a Peruvian peri-urban community (pueblo joven) to examine the relation between diarrhea and nutritional status in 230 children <3 years of age.
Methods:
We followed the birth cohort daily for diarrhea and monthly for anthropometry. We modeled diarrheal incidence with a multivariate time-to-event regression model to account for multiple episodes per child and irregular follow-up periods and diarrheal duration with a mixed-effects gamma regression model to account for disease heterogeneity across children.
Results:
During 159,551 child-days of follow-up, we identified 1387 diarrheal episodes, which yielded an average incidence of 3.2 episodes per child-year. Diarrhea was seasonal, for example, infants had up to 8 diarrheal episodes during the summer; however, these variations decreased noticeably with age. Nutritional status was significantly associated with diarrheal incidence. The frequency of diarrhea increased by 15% per standard deviation decrease in height-for-age z score. Diarrheal episodes in children <6 months of age lasted significantly longer than episodes among older children.
Conclusions:
These results identify infants and children of poor nutritional status as priority risk groups for prevention efforts aimed at reducing the burden of acute childhood diarrhea.