BMC Public Health

Table 4 Associations between pregnancy exposure to air pollutions and preterm birth/low birth weight

From: The association between air pollution and preterm birth and low birth weight in Guangdong, China

	Preterm birth				Low birth weight
	First trimester	Second trimester	Third trimester	Whole pregnancy	First trimester	Second trimester	Third trimester	Whole pregnancy
PM_2.5
OR	1.043^a	1.056	1.038^a	1.007^a	1.063	1.061	0.925	1.028^a
95% CI	1.01~1.09	0.98~1.14	1.01~1.12	1.01~1.08	0.98~1.15	0.99~1.13	0.86~0.99	1.00~1.06
PM₁₀
OR	1.039^a	1.031	1.024^a	1.038^a	0.967^a	1.046	0.937^a	1.018^a
95% CI	1.01~1.14	.96~1.10	1.02~1.09	1.01~1.07	0.91~1.03	0.99~1.11	0.88~0.99	1.01~1.04
SO₂
OR	0.990	1.112	1.081^a	1.047	0.907	0.927^a	1.019	1.007
95% CI	0.82~1.19	0.89~1.38	1.01~1.29	0.95~1.15	0.77~1.07	0.89~0.96	0.98~1.05	0.99~1.02
NO₂
OR	1.130	1.078	0.970	1.051	0.916	1.124^a	0.896	1.039
95% CI	0.98~1.30	0.96~1.21	0.88~1.06	0.99~1.11	0.84~1.00	1.02~1.24	0.83~1.10	0.99~1.09
CO
OR	1.059	0.839^a	0.991	1.276	1.063^a	0.845^a	0.974	1.340^a
95% CI	0.98~1.14	0.76~0.92	0.92~1.06	0.97~1.68	1.00~1.14	0.77~0.92	0.91~1.04	1.04~1.73
O₃
OR	0.891	0.932	1.016^a	1.000	0.895	0.979	1.023	0.999
95% CI	0.76~1.04	0.89~1.06	1.004~1.35	0.99~1.01	0.778~1.03	0.87~1.10	0.889~1.18	0.99~1.00

Note: ^a p<0.05

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ISSN: 1471-2458

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