Impact of Oral Polio Vaccine on Infant Mortality in Guinea-Bissau
Author Information
Author(s): Benn Christine Stabell, Fisker Ane Bærent, Rodrigues Amabelia, Ravn Henrik, Sartono Erliyani, Whittle Hilton, Yazdanbakhsh Maria, Aaby Peter
Primary Institution: Bandim Health Project, Statens Serum Institut, Copenhagen, Denmark
Hypothesis
Not receiving OPV at birth would increase mortality, particularly for girls.
Conclusion
The study found that OPV at birth had a sex-differential effect on mortality, decreasing mortality in boys but potentially increasing it in girls.
Supporting Evidence
- A total of 962 (22.1%) of the 4345 enrolled children did not receive OPV at birth.
- Missing OPV at birth was associated with a tendency for decreased mortality.
- There was a highly significant interaction between OPV at birth and sex (p=0.006).
- Not receiving OPV at birth was associated with a weak tendency for increased mortality in girls but significantly decreased mortality in boys.
Takeaway
Giving the polio vaccine at birth helps boys live longer, but it might not be good for girls.
Methodology
The study used Cox proportional hazards models to analyze mortality rates among infants who received or did not receive OPV at birth.
Potential Biases
There may be bias due to differences in maternal education and health status among those who did and did not receive OPV.
Limitations
The study was observational and may have uncontrolled confounding factors.
Participant Demographics
Infants enrolled in a vitamin A supplementation trial in Guinea-Bissau, with a significant proportion from low-education backgrounds.
Statistical Information
P-Value
0.006
Confidence Interval
0.46–1.03
Statistical Significance
p=0.006
Digital Object Identifier (DOI)
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