Table 3. Hazard ratio (HR) for cancer and cardiovascular related mortality in childhood participants in relation to baseline arsenic exposure.

Exposure variables	Baseline participant	Person-years	Deaths	Rate*	HR (95% CI)
Baseline arsenic in well water					Unadjusted	Adjusted†
<10	28853	189047	16	8.5	1.0	1.0
10–50	5083	33549	4	11.9	1.41 (0.47–4.21)	1.53 (0.51–4.57)
51–150	5629	36918	4	10.8	1.28 (0.43–3.83)	1.29 (0.43–3.87)
>150	18743	121586	22	18.9	2.14 (1.12–4.07)	2.18 (1.15–4.16)

Test for Trend, P<0.05,

^*Mortality rates per 100,000 person-years,

^†Adjusted with baseline age, sex education attainment and socioeconomic status.