Table 6 Hazard ratios (95% CI) for categorized (<median (ref.), ≥median) maximum cumulative exposure and coefficients (95% CI) for continuous cumulative exposure (μg/L-year)

a. Kidney Cancer (N = 7)

Contaminant

≥ Median Exposure

Cumulative Exposure

Log₁₀ Cumulative Exposure

Benzene

1.82 (0.34, 9.78) N = 5

0.0240 (−0.0080, 0.0559) p = .14

1.3595 (−0.3324, 3.0515) p = .11

TVOC

4.44 (0.52, 38.19) N = 6

0.0002 (−0.0001, 0.0006) p = .13

1.3626 (−0.4550, 3.1801) p = .14

PCE

Inf. N = 7

0.0100 (−0.0019, 0.0219) p = .10

1.4753 (−0.2983, 3.2489) p = .10

TCE

Inf. N = 7

0.0004 (−0.0001, 0.0009) p = .12

1.3551 (−0.4666, 3.1768) p = .14

Vinyl Chloride

Inf N = 7

0.0063 (−0.0015, 0.0141) p = .11

1.4370 (−0.3327, 3.2066) p = .11

b. Parkinson’s Disease (N = 5)

Contaminant

≥ Median Exposure

Cumulative Exposure

Log₁₀ Cumulative Exposure

PCE

2.68 (0.22, 33.28) N = 4

0.0199 (0.0005, 0.0393) p = .04

1.9718 (−0.8134, 4.7569) p = .16

TCE

2.51 (0.21, 30.76) N = 4

0.0009 (0.0001, 0.0017) p = .04

2.6244 (−0.7668, 6.0156) p = .13

Vinyl Chloride

2.81 (0.23, 34.11) N = 4

0.0129 (0.0005, 0.0253) p = .04

2.0982 (−0.7936, 4.9900) p = .15

Benzene

2.52 (0.20, 31.59) N = 4

0.0490 (0.0008, 0.0971) p = .05

2.0910 (−0.7578, 4.9398) p = .15

TVOC

2.52 (0.21, 30.83) N = 4

0.0005 (<0.0001, 0.0011) p = .04

2.6729 (−0.7448, 6.0905) p = .12