Skip to main content

Table 4 Interaction of covariates and PM2.5 exposure during first trimester with the risk of HDP

From: Correlation between exposure to fine particulate matter and hypertensive disorders of pregnancy in Shanghai, China

Covariates

Multiplicative scale

Additive scale

RR (95% CI)

RERI (95% CI)a

Maternal age (≥ 35 years)

0.61 (0.33–1.15)

0.32 (− 0.18–0.81)

Parity (Nulliparous)

2.28 (1.28–4.06)

0.92 (0.46–1.38)

Parental history of chronical diseases (Yes)

1.04 (0.69–1.55)

0.20 (− 1.22–1.62)

Season of conception (Spring or winter)

0.89 (0.31–1.92)

−0.09 (− 1.62–1.44)

Pre-conception BMI (Underweight)

2.03 (0.93–4.46)

0.42 (− 0.10–0.93)

Pre-conception BMI (Overweight or obesity)

1.24 (0.81–1.87)

0.26 (−0.47–0.99)

  1. aRERI = 0: indicates no interaction. RERI < 0: indicates negative interaction or less than additive interaction. RERI > 0: indicates positive interaction or more than additive interaction
Back to article page

Environmental Health

ISSN: 1476-069X