Study

Exposure Category

Number of Cases

Number of Controls

Crude ORa

95% CIb

Adjusted ORc

Adjusted 95% CId

Potential Confounders Addressede

 

Spot measurements:

4

70

0.6

(0.2-1.8)

 

 

 

=0.2 µT

1

67

0.2

(0.0-0.9)

 

 

 

0.1-0.19 µT

19

207

 

 

 

 

 

<0.1 µT

 

 

 

 

 

 

 

Olsen et al. 1993

Estimated Fields:

 

 

 

 

 

 

Sex, onset age, age

 

= 0.4 µT

3

1

6.0

(0.8-4.4)

 

 

0.1-0.39 µT

1

7

0.3

(0.0-2.0)

 

 

= 0.25 µT

5

4

1.5

(0.3-6.7)

 

 

0.1-0.24 µT

1

4

0.5

(0.1-4.3)

 

 

=0.1 µT

4

8

1.0

(0.3-3.3)

 

 

<0.1 µT

829

1658

 

 

Study

Exposure

Cases observed

Cases Expectedh

Standardized Incidence Ratio

95% CI

Potential Confounders Addressed

Verkasalo et al. 1993

= 0.2 µT

3

1.93

1.6

0.3-4.5

Age, sex

 

0.01-0.19 µT

32

36.1

0.9

0.6-1.3

 

 

= 0.4 µT-yr

3

 

 

1.2

0.3-3.6

 

 

0.01-0.39 µT-yr

32

 

 

0.9

0.6-1.3

 

a Odds ratio calculated without consideration of possible confounders (ratio of exposed to unexposed cases divided by the ratio of exposed to unexposed controls).

b 95% confidence intervals for the odds ratio calculated without consideration of possible confounders.

c Odds radio adjusted statistically for possible confounding factors.

d Corresponding confidence intervals calculated for the odds ratio adjusted for possible confounding factors.

e Includes all factors considered to be potential confounders whether or not statistical adjustments were made for them.

f HCC, high current configuration.

g LCC, low current configuration.

h Cases expected on the basis of incidence data for the disease in the general population.



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