Table 1.

Characteristics of the study population stratified by gender.

	men	women
Total n (%)	240 (32.2)	506 (67.8)
Age, mean (SD)	23.3 (19)	31 (17.7)
SNP genotypes
7388 (GG/GC/CC)	145/80/15	320/162/24
M287T (TT/TC/CC)	219/21/0	448/57/1
Weight, mean* (SD)	54.4 (24.3)	63.6 (21.9)
Height, mean^ (SD)	153.3 (19.6)	153.1 (12.4)
Body mass index, n (%)
underweight (<18.4)	87 (36.2)	81 (16)
normal (18.5–24.9)	68 (28.3)	135 (26.7)
overweight (25–29.9)	69 (28.8)	132 (26.1)
obese (>30)	16 (6.7)	158 (31.2)
AME ancestry proportion, mean (SD)	72.8 (15.4)	73.6 (15.5)
Total urinary arsenic+, mean (SD)	223.9 (170.5)	145 (121.2)
InAs+, mean (SD)	33.9 (30.1)	19.7 (19.8)
uMMA+, mean (SD)	28.2 (23.1)	16 (15.3)
uDMA+, mean (SD)	161.7 (125.1)	109.3 (91.9)
%uMMA, mean (SD)	12.5 (3.9)	11.1 (4.3)

SD: standard deviation. AME: Indigenous American. Age reported in years,

^*Weight reported in Kg,

^{^}Height reported in centimeters,

⁺Arsenic species reported in part per billion (ppb).