Prenatal PM_2.5 affects atopic dermatitis depending on maternal anxiety and gender: COCOA study

Area of Science:

• Environmental Health
• Pediatric Dermatology
• Reproductive Epidemiology

Background:

• Global rise in atopic dermatitis (AD) prevalence.
• Prenatal exposure to fine particulate matter (PM2.5) and maternal anxiety are potential AD risk factors.
• Need to identify critical exposure periods for infant AD.

Purpose of the Study:

• Investigate the impact of prenatal PM2.5 and maternal anxiety on infant AD.
• Determine the critical window of PM2.5 exposure for AD development.

Main Methods:

• Analysis of 802 children from the COCOA birth cohort study.
• Estimation of prenatal PM2.5 using land-use regression models.
• Assessment of prenatal anxiety via questionnaire; AD diagnosis at 1 year.
• Application of logistic regression and Bayesian distributed lag interaction models.

Main Results:

• Increased AD risk associated with higher first-trimester PM2.5, higher maternal anxiety, and male gender.
• Synergistic effect of PM2.5 and maternal anxiety on AD risk.
• Critical period for PM2.5 exposure identified as gestational weeks 5-8 for boys with high maternal anxiety.

Conclusions:

• First-trimester PM2.5 exposure (weeks 5-8) heightens infant AD risk, especially in boys with maternal anxiety.
• Reducing PM2.5 exposure and maternal anxiety early in pregnancy may prevent infant AD.