A birthweight nomogram for Africa, as a malaria-control indicator

Area of Science:

• Global Health
• Tropical Medicine
• Public Health

Background:

• Malaria in pregnancy is a major cause of low birthweight (LBW) in Africa.
• First-time mothers (primigravidae) face the highest risk of LBW due to malaria.
• Existing methods for monitoring malaria transmission are often complex or resource-intensive.

Purpose of the Study:

• To develop a simple birthweight chart (nomogram) as an indicator of malaria transmission intensity in pregnant women.
• To assess the utility of LBW risk in first pregnancies for monitoring malaria exposure.
• To evaluate the nomogram's effectiveness in tracking seasonal changes and antimalarial drug policy impacts.

Main Methods:

• Analysis of birthweight data from 11 malarious and 3 non-malarious African countries.
• Regression analysis comparing LBW risk in first pregnancies versus later pregnancies.
• Interpretation of excess LBW risk in relation to malaria transmission intensities.

Main Results:

• A strong association was found between LBW risk in first pregnancies and malaria transmission intensity across African regions.
• The developed nomogram effectively distinguished longitudinal changes in malaria exposure.
• The nomogram reflected seasonal variations and impacts of antimalarial drug policy on malaria exposure.

Conclusions:

• Malaria is a primary contributor to LBW in first pregnancies across Africa.
• The birthweight nomogram serves as a simple, accessible, and cost-effective tool for monitoring malaria transmission.
• This tool can help assess the effectiveness of malaria control strategies for pregnant women.