Effect of ambient air pollution on premature SGA in Changzhou city, 2013–2016: a retrospective study

BMC Public Health

Table 1 Summary of estimated air pollutants by exposure period

Pollutant (μg/m³)	Mean	SD	Percentile
Pollutant (μg/m³)	Mean	SD	Min	5th	25th	50th	75th	95th	Max	IQR ^b
PM_2.5
Trimester1	39.80	31.82	5.72	30.95	41.12	53.97	66.88	77.58	98.43	25.76
Trimester2	53.63	20.68	9.08	37.42	49.29	60.31	66.91	78.51	90.65	17.61
Trimester3	59.98	15.62	7.19	36.34	46.15	61.43	70.79	83.17	95.17	24.64
Whole gestation	51.11	16.03	12.32	25.67	37.40	53.75	63.85	74.19	86.94	26.45
SO₂
Trimester1	21.37	16.57	8.52	12.37	16.45	28.41	34.88	42.25	50.57	18.43
Trimester2	26.21	10.50	10.88	15.86	22.50	28.96	33.10	38.32	48.01	10.60
Trimester3	28.82	8.27	10.05	16.10	23.44	30.33	34.04	41.69	48.31	10.59
Whole gestation	25.46	8.52	5.44	11.31	18.82	26.45	32.72	37.38	45.51	13.90
NO₂
Trimester1	28.03	22.30	9.24	21.85	32.00	40.09	46.68	52.05	78.89	14.68
Trimester2	34.62	14.99	10.07	12.63	24.40	39.91	45.50	50.79	57.13	21.10
Trimester3	43.08	7.24	10.02	33.37	39.96	43.95	46.99	52.33	57.47	7.03
Whole gestation	35.23	10.50	11.47	15.33	27.95	38.12	43.72	49.12	57.44	15.77

ISSN: 1471-2458