Table 4.

Cognitive, language and motor composite scale scores during the first 24 months of age associated with 1 μg/m³ increase in the mean PM_2.5 prenatal level^a

Scale	Ageb	PM2.5 window of exposure
		1st trimester			2nd trimester			3rd trimester			All pregnancy
		β	p	95% CI	β	p	95% CI	β	p	95% CI	β	p	95% CI
Cognitive		−0.26	0.04	−0.51, −0.02	−0.50	0.00	−0.75, −0.25	−0.21	0.04	−0.42, −0.01	−0.93	0.00	−1.27, −0.58
Language	6	−0.31	0.02	−0.56, −0.06	−0.39	0.00	−0.65, −0.13	−0.30	0.01	−0.52, −0.09	−0.95	0.00	−1.29, −0.60
Motor		−0.13	0.31	−0.37, 0.12	−0.11	0.40	−0.36, 0.14	0.10	0.33	−0.10, 0.31	−0.14	0.42	−0.49, 0.20
Cognitive		0.05	0.70	−0.19. 0.28	0.03	0.80	−0.21, 0.27	−0.26	0.01	−0.45, −0.07	−0.14	0.35	−0.43, 0.15
Language	12	−0.18	0.14	−0.41. 0.06	−0.05	0.69	−0.29, 0.19	−0.27	0.01	−0.47, −0.08	−0.58	0.00	−0.88, −0.28
Motor		0.07	0.55	−0.16, 0.30	0.14	0.26	−0.10, 0.38	−0.17	0.09	−0.36, 0.02	−0.01	0.93	−0.31, 0.28
Cognitive		0.17	0.16	−0.07, 0.41	−0.02	0.86	−0.27, 0.23	−0.20	0.04	−0.39, −0.01	−0.13	0.40	−0.44, 0.18
Language	18	0.00	0.99	−0.25, 0.24	0.01	0.96	−0.25, 0.26	−0.08	0.43	−0.27, 0.12	−0.08	0.63	−0.38, 0.23
Motor		0.14	0.26	−0.11, 0.39	0.08	0.52	−0.17, 0.34	−0.04	0.71	−0.23, 0.16	0.13	0.41	−0.18, 0.44
Cognitive		0.26	0.05	0.00, 0.51	0.14	0.34	−0.14, 0.42	−0.14	0.20	−0.35, 0.07	0.07	0.73	−0.31, 0.45
Language	24	−0.11	0.41	−0.36, 0.15	−0.12	0.40	−0.40, 0.16	−0.12	0.28	−0.33, 0.09	−0.38	0.05	−0.77, −0.01
Motor		0.24	0.07	−0.02, 0.50	0.13	0.35	−0.15, 0.41	−0.02	0.88	−0.23, 0.20	0.19	0.33	−0.19, 0.57

95% CI: 95% confidence interval; P: p value

The number of mother–child pairs included in the analysis n=445

^aModels adjusted by child’s sex, gestational age, birthweight, prenatal smoking and maternal IQ.

^bAge at evaluation in months