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Summary
Social class impacts birth outcomes, with lower social class linked to smaller babies after accounting for factors like smoking and hypertension. Obesity in lower classes counterbalances height benefits in higher classes for larger babies.
Area of Science:
- Perinatal epidemiology
- Social determinants of health
- Maternal-fetal medicine
Background:
- Social class is a known determinant of birthweight.
- Interactions between social class and maternal factors require further investigation.
Purpose of the Study:
- To examine the effect of social class on birthweight.
- To investigate the interaction between social class and maternal factors (smoking, hypertension, age, height, weight) on small-for-dates (SFD) and large-for-dates (LFD) babies.
Main Methods:
- Analysis of birthweight categories: SFD, average-for-dates (AFD), and LFD.
- Calculation of relative risks adjusted for multiple maternal factors.
- Stratified analysis by social class and birthweight extremes.
Main Results:
- Lower social class had a decreased risk of SFD babies (1.75 to 1.20) after adjusting for smoking, hypertension, maternal age, and height.
- Lower social class showed a non-significant risk of LFD babies (1.12) after weight adjustment, despite an initial rise (1.45) with height.
- Obesity in lower social classes appears to offset protective factors for LFD babies.
Conclusions:
- Social class and maternal factors interact complexly, not symmetrically, across birthweight spectrum.
- Maternal obesity in lower social classes plays a significant role in counterbalancing other factors influencing LFD outcomes.
- Public health strategies should consider these nuanced interactions for targeted interventions.