Table 4 Spearman correlations between air pollutants and birth weight, birth length and gestational age in two geographical radii.

From: Geographical approach analysis of the impact of air pollution on newborn intrauterine growth and cord blood DNA damage in Mexico City

	Buffers used to estimate the level of exposure (radius)
	750 m			250 m
Pollutant and source	Weight	Length	Gestational age	Weight	Length	Gestational age
Pollutant and source	ρ coefficient	ρ coefficient	ρ coefficient	ρ coefficient	ρ coefficient	ρ coefficient
PM10
Area sources	−0.22***	−0.17**	−0.28****	−0.23***	−0.18**	−0.27****
Point sources	−0.04	−0.13*	−0.14*	−0.00	−0.15*	−0.01
Mobile sources	−0.09	−0.07	−0.10	−0.11	−0.07	−0.15*
Natural sources	0.17*	0.15*	0.22**	0.17**	0.12*	0.20**
Overall emissions	−0.20**	−0.21**	−0.28****	−0.21**	−0.21**	−0.29****
PM2.5
Area sources	−0.12*	−0.09	−0.10	−0.13*	−0.11	−0.12#
Point sources	−0.06	−0.13*	−0.11	−0.02	−0.15*	−0.01
Mobile sources	−0.11#	−0.10	−0.14*	−0.13*	−0.09	−0.19**
Natural sources	0.17**	0.15*	0.22**	0.18**	0.12*	0.20**
Overall emissions	−0.13*	−0.16*	−0.20**	−0.15*	−0.18**	−0.22**
VOC
Area sources	0.03	0.01	0.03	0.03	0.01	−0.02
Point sources	0.05	−0.07	0.02	0.08	−0.10	0.07
Mobile sources	−0.06	−0.05	−0.07	−0.09	−0.05	−0.11
Natural sources	0.19**	0.16*	0.25***	0.19**	0.14*	0.23***
Overall emissions	0.01	−0.04	−0.05	0.00	−0.03	−0.08
TOX
Area sources	0.05	0.02	0.04	0.05	0.04	−0.03
Point sources	0.06	−0.04	0.02	0.02	−0.10	0.06
Mobile sources	−0.07	−0.06	−0.11	−0.11	−0.06	−0.15*
Natural sources	0.19**	0.16*	0.25***	0.20**	0.15*	0.23***
Overall emissions	0.01	−0.01	−0.04	−0.02	−0.02	−0.08
TOC
Area sources	0.04	0.02	0.05	0.01	0.02	−0.02
Point sources	0.06	−0.05	0.02	0.07	−0.10	0.05
Mobile sources	−0.06	−0.05	−0.07	−0.08	−0.05	−0.10
Natural sources	0.19**	0.16*	0.25***	0.20**	0.15*	0.23***
Overall emissions	0.02	−0.02	−0.02	−0.02	−0.02	−0.08

#P < 0.06 (Marginal) *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001.

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