The Effect of Lead Exposure on Children’s Learning in the Developing World: A Meta-Analysis
Lee Crawfurd et al.
What the paper says
Abstract Around half of children in low-income countries have elevated blood-lead levels. What role does lead play in explaining low educational outcomes in these settings? We conduct a new systematic review and meta-analysis of observational studies on the relationship between lead exposure and learning outcomes. Adjusting for observable confounds and publication bias yields a benchmark estimate of a $-0.12$ standard-deviation reduction in learning per natural log unit of blood lead. As all estimates are non-experimental, we present evidence on the likely magnitude of unobserved confounding, and summarize results from a smaller set of natural experiments. Our benchmark estimate accounts for over a fifth of the gap in learning outcomes between rich and poor countries, and implies moderate learning gains from targeted interventions for highly exposed groups ($\approx$ 0.1 standard deviations) and modest learning gains ($\lt 0.05$ standard deviations) from broader public health campaigns.
6 citations
Evidence weight
Balanced mode · F 0.40 / M 0.15 / V 0.05 / R 0.40
| F · citation impact | 0.44 × 0.4 = 0.18 |
| M · momentum | 0.65 × 0.15 = 0.10 |
| V · venue signal | 0.50 × 0.05 = 0.03 |
| R · text relevance † | 0.50 × 0.4 = 0.20 |
† Text relevance is estimated at 0.50 on the detail page — for your query’s actual relevance score, open this paper from a search result.