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The human capital study 2002-04: tracking, data collection, coverage, and attrition.

Rubén Grajeda1, Jere R Behrman, Rafael Flores

  • 1Institute of Nutrition of Central America and Panama, INCAP, P.O. Box 1188, Guatemala, Carretera Roosevelt, Zona 11 Guatemala, Central America. Rgrajeda@incap.ops-oms.org

Food and Nutrition Bulletin
|August 3, 2005
PubMed
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Early-life nutrition supplementation and epigenetic age in middle-adulthood among Guatemalan adults.

bioRxiv : the preprint server for biology·2025

Researchers re-surveyed Guatemalan adults who received nutrition supplementation as children. This Human Capital Study collected extensive data on health, education, and economic factors to investigate long-term impacts.

Area of Science:

  • Public Health and Nutrition
  • Human Capital Development
  • Longitudinal Studies

Background:

  • The Institute of Nutrition of Central America and Panama (INCAP) conducted a significant nutrition supplementation trial from 1969-1977.
  • Previous studies provided initial data on participants, necessitating updated information to assess long-term outcomes.

Purpose of the Study:

  • To re-survey young Guatemalan adults who participated in an early childhood nutrition trial.
  • To collect comprehensive data on physical health, cognitive ability, economic productivity, and social factors.
  • To establish a foundation for investigating the long-term effects of early-life nutrition interventions.

Main Methods:

  • The Human Capital Study 2002-04 re-enrolled individuals from the original INCAP trial sample.

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  • Data collection encompassed multiple domains: physical health, cognitive function, schooling, wealth, consumption, economic productivity, and reproductive histories.
  • Statistical analysis will account for non-random attrition observed in the re-surveyed population.

    • Main Results:

    • 1,856 out of 2,393 targeted individuals (77%) were enrolled in the 2002-04 follow-up.
    • Response rates varied by demographics and location, with higher participation among females (89%) than males (80%).
    • Attrition was identified as non-random, influenced by initial individual and household characteristics.

    Conclusions:

    • The Human Capital Study 2002-04 successfully collected high-quality data from a significant portion of the target population.
    • The collected data are suitable for analyzing the long-term impacts of early childhood nutrition supplementation on human capital.
    • Future analyses will require controlling for attrition bias to ensure valid study findings.