Table 5 The result of relationship between infant characteristics and metals by multivariate regression.

Responses	Metals	Non-expose to SHS group			Expose to SHS group
Responses	Metals	Beta	SE	p-value	Beta	SE	p-value
Birth weight (gr)	Se	-0.002	0.007	0.765	-0.002	0.003	0.483
	Zn	0.0003	0.0004	0.540	-0.0003	0.0003	0.326
	Cu	0.001	0.002	0.622	-0.002	0.001	0.016*
	Fe	-0.002	0.001	0.225	-0.001	0.001	0.319
	As	-0.103	0.068	0.139	0.016	0.043	0.710
	Cd	0.762	0.511	0.146	0.454	0.239	0.063
	Cr	-0.144	0.108	0.192	0.063	0.031	0.044*
	Hg	0.186	0.389	0.636	0.254	0.245	0.303
	Ni	0.078	0.069	0.270	-0.034	0.023	0.147
	Pb	-0.029	0.038	0.447	0.004	0.016	0.790
Birth length (cm)	Se	0.001	0.023	0.958	-0.007	0.008	0.422
	Zn	-0.001	0.001	0.398	-0.002	0.001	0.040*
	Cu	-0.003	0.006	0.661	-0.001	0.003	0.601
	Fe	-0.006	0.006	0.348	-0.002	0.003	0.436
	As	-0.039	0.231	0.867	0.209	0.133	0.121
	Cd	3.762	1.725	0.036*	1.548	0.739	0.041*
	Cr	-0.435	0.365	0.242	0.329	0.095	0.001*
	Hg	2.453	1.316	0.071	-1.864	0.756	0.017*
	Ni	0.269	0.234	0.258	-0.234	0.072	0.002*
	Pb	0.002	0.130	0.984	0.112	0.051	0.033*
Head circumference (cm)	Se	-0.056	0.020	0.009	-0.004	0.007	0.594
	Zn	0.001	0.001	0.644	0.001	0.001	0.241
	Cu	-0.001	0.006	0.868	-0.006	0.002	0.016
	Fe	-0.006	0.005	0.215	0.001	0.003	0.868
	As	-0.542	0.203	0.012	0.059	0.120	0.626
	Cd	1.956	1.517	0.206	0.484	0.665	0.469
	Cr	-0.310	0.321	0.342	0.253	0.086	0.005*
	Hg	-0.068	1.157	0.953	0.590	0.681	0.389
	Ni	0.149	0.205	0.472	-0.140	0.065	0.036*
	Pb	-0.092	0.114	0.429	0.080	0.046	0.093

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