Table 2. Association of PM_2.5 Exposure during the Entire Pregnancy (Each SD) and the Alpha Diversity of Neonatal Feces^a.

alpha diversity	β	upper	lower	P value
Shannon	–0.367	–0.543	–0.192	<0.001
Chao1	–9.381	–14.416	–4.347	<0.001
PD	–30.904	–46.362	–15.446	<0.001
Simpson	–0.054	–0.090	–0.017	0.004

^aAdjustment for parental characteristics (parity, maternal age, maternal pregravid BMI, maternal physical activity, maternal educational level, annual family income, passive smoking status, season of conception, paternal age, premature birth, GWG, temperature, and relative humidity) and child characteristics (feeding patterns, birthweight, and child sex).