Table 2 Relationship between exposure to air pollutants and risk of FGR in the first trimester after propensity score matching.

From: The effect of air pollution exposure on foetal growth restriction in pregnant women who conceived by in vitro fertilisation a cross-sectional study

Variable

Quartiles

Crude

Adjusteda

OR (95% CI)

p-value

OR (95% CI)

p-value

PM2.5

Q1 (< 20.32)

1 (Ref)

 

1 (Ref)

 

Q2 (20.32–25.63)

0.610 (0.114–3.256)

0.563

0.644 (0.110–3.765)

0.625

Q3 (25.63–32.04)

1.372 (0.364–5.164)

0.640

1.980 (0.442–8.869)

0.372

Q4 (≥ 32.04)

2.110 (0.467–9.533)

0.332

4.202 (0.640–27.59)

0.135

PM10

Q1 (< 37.79)

1 (Ref)

 

1 (Ref)

 

Q2 (37.79–44.71)

0.818 (0.197–3.391)

0.782

1.084 (0.235–5.011)

0.917

Q3 (44.71–53.66)

0.805 (0.188–3.446)

0.770

1.106 (0.224–5.449)

0.902

Q4 (≥ 53.66)

2.272 (0.602–8.569)

0.226

6.430 (1.035–39.96)

0.046

NO2

Q1 (< 23.00)

1 (Ref)

 

1 (Ref)

 

Q2 (23.00-32.24)

1.393 (0.288–6.728)

0.680

2.079 (0.399–10.84)

0.385

Q3 (32.24–37.65)

2.750 (0.506–14.95)

0.241

5.563 (0.716–43.23)

0.101

Q4 (≥ 37.65)

3.779 (0.707–20.20)

0.120

10.73 (1.230–93.48)

0.032

O3

Q1 (< 44.61)

1 (Ref)

 

1 (Ref)

 

Q2 (44.61–53.60)

0.564 (0.138–2.301)

0.425

0.417 (0.090–1.940)

0.265

Q3 (53.60-57.18)

0.168 (0.036–0.790)

0.024

0.071 (0.010–0.485)

0.007

Q4 (≥ 57.18)

0.278 (0.060–1.289)

0.102

0.165 (0.029–0.943)

0.043

  1. aAdjusted for age, occupation, pregnancy type, embryo type, anaemia, infant gender and SO2.
  2. Q quartiles, FGR Foetal growth restriction, OR odds ratio, 95% CI 95% confidence interval, PM2.5 particulate matter with aerodynamic diameter of ≤ 2.5 μm, PM10 particles matter with an aerodynamic equivalent diameter ≤ 10 μm, NO2 nitrogen dioxide, O3 ozone, Ref Reference.
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