Table 2.

Distribution of selected variables by cohort.

Variables	Original cohort ($n=50$)	Expansion cohort ($n=62$)	p-Valuea
Age (y)	$34.3\pm 5.8$	$35.0\pm 5.4$	0.50
Body mass index (${\mathrm{kg}/\mathrm{m}}^2$)	$19.8\pm 2.5$	$21.0\pm 3.8$	0.07
Education (y)	$3.8\pm 4.0$	$3.9\pm 3.7$	0.92
Systolic blood pressure (mmHg)	$112.1\pm 14.5$	$120.5\pm 13.3$	0.002
Diastolic blood pressure (mmHg)	$73.6\pm 9.4$	$77.8\pm 11.2$	0.04
Baseline total water arsenic ($\mathrm{\mu }\mathrm{g}/\mathrm{L}$)	$55.6\pm 59.4$	$38.4\pm 42.7$	0.08
Baseline total urinary arsenic ($\mathrm{\mu }\mathrm{g}/\mathrm{g}$ creatinine)	$222.9\pm 191.5$	$182.0\pm 156.4$	0.22
Follow-up total urinary arsenic ($\mathrm{\mu }\mathrm{g}/\mathrm{g}$ creatinine)	$197.6\pm 162.4$	$174.8\pm 133.4$	0.42

^ap-Values were computed with the chi-square test or analysis of variance.