Table 1 Association of PM2.5 exposure with the peak bilirubin levels on the basis of an increase of 1.0 μg per m3 (95 % CI) in exposure to PM2.5

From: Air pollution exposure associates with increased risk of neonatal jaundice

Exposure intervals (μg per m3)

Risk in peak bilirubin levels (mg per dL)

Confidence lower limit (mg per dL)

Confidence upper limit (mg per dL)

P value

(0, 10)

0.848

−0.574

2.269

0.157

(10, 35)

0.076

0.027

0.125

0.003

(35,75)

0.029

0.014

0.044

0.031

(75, 200)

0.009

0.002

0.016

0.008

>200

0.01

−0.008

0.028

0.435

  1. For PM2.5 concentrations ∈ [10, 35] μg per m3, a 1.0 μg per m3 increase in PM2.5 concentrations was associated with a 0.076 mg per dL (95% CI: 0.027–0.125) rise in the peak bilirubin level. For a 1.0 μg per m3 increase in PM2.5 concentration, the peak bilirubin level increased by 0.029 mg per dL (95% CI: 0.014–0.044) for PM2.5 concentrations ∈ (35, 75] μg per m3, and by 0.009 mg per dL (95% CI: 0.002–0.016) for PM2.5 concentrations ∈ (75, 200] μg per m3. The relationship between PM2.5 concentrations and the neonatal jaundice risk nearly plateaued at concentrations exceeding 200 μg per m³, such that an additional increase in pollution concentration was not statistically significantly associated with a further increase in bilirubin level
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