Table 1. Parental socio-demographics characteristics by prenatal exposure to total arsenic detected in meconium.

			n	AsDetected	n	AsNon-Detected	p-value
Maternal age (years), mean (SD)			28	30.9 (4.5)	46	29.9 (5.2)	0.374
Parental country of origin (Spain/Other), (%)
Non-Spanish Mothers			4	14.8	5	10.6	0.597
Non-Spanish Fathers			5	19.2	5	10.6	0.307
Parental Educational Level (%)
Mother’s		Primary education & Illiterate	4	15.4	12	26.1	0.057
		Secondary education	9	34.6	24	52.2
		University degree	4	15.4	8	17.4
		Advanced University degree	9	34.6	2	4.3
Father’s		Primary education & Illiterate	6	24.0	18	38.3	0.564
	Secondary education		9	36.0	17	36.2
	University degree		4	16.0	6	12.8
	Advanced University degree		6	24.0	6	12.8
Parental Employment (yes/no), (%)
Unemployed Mother			4	15.4	9	19.1	0.687
Unemployed Father			1	3.7	4	8.5	0.428
Parental socioeconomic status (%)
Mother’s		Professional	1	4.5	3	7.9	0.403
		Managerial/Technical	8	36.4	6	15.8
		Skilled	5	22.7	9	23.7
		Partly skilled	7	31.8	15	39.5
		Unskilled	1	4.5	5	13.2
Father’s		Professional	5	19.2	5	11.9	0.058
		Managerial/Technical	4	15.4	13	31.0
		Skilled	7	26.9	2	4.8
		Partly skilled	8	30.8	20	47.6
		Unskilled	2	7.7	2	4.8
Area of residence (%)
Rural (<10.000 hab)			4	13.8	7	15.2	0.888
Semiurban (10–100.000 hab)			12	41.4	21	45.7
Urban (>100.000 hab)			13	44.8	18	39.1

Chi-square test; p<0.05.