Table 5 Comparison of the odds ratios for association between childhood leukaemia and distance to closest overhead 200 + kV power line with and without adjustment for specific confounders

Ecological SES—studies 2, 3, 8, 9, 10, 11

  Not adjusted^a

1.00 (reference)

1.01 (0.87–1.18)

0.90 (0.72–1.12)

1.28 (0.85–1.93)

  Adjusted^b

1.00 (reference)

1.02 (0.87–1.18)

0.90 (0.72–1.12)

1.28 (0.85–1.93)

Individual SES—studies 1, 5, 6, 7, 11

  Not adjusted^a

1.00 (reference)

0.83 (0.63–1.10)

1.09 (0.77–1.54)

1.49 (0.85–2.59)

  Adjusted^b

1.00 (reference)

0.83 (0.63–1.10)

1.09 (0.77–1.55)

1.48 (0.85–2.58)

Mobility—studies 1, 5, 6, 7, 9

  Not adjusted^a

1.00 (reference)

0.90 (0.43–1.90)

1.84 (1.00–3.38)

2.05 (0.78–5.36)

  Adjusted^b

1.00 (reference)

0.87 (0.41–1.86)

1.72 (0.93–3.20)

2.09 (0.79–5.51)

Dwelling type—studies 1, 6, 7, 11

  Not adjusted^a

1.00 (reference)

0.95 (0.51–1.79)

1.64 (1.04–2.58)

2.59 (1.35–4.99)

  Adjusted^b

1.00 (reference)

0.96 (0.51–1.81)

1.66 (1.05–2.61)

2.62 (1.36–5.03)

Traffic—studies 3, 4, 7, 8

  Not adjusted^a

1.00 (reference)

0.99 (0.77–1.26)

1.02 (0.73–1.42)

1.78 (1.06–2.98)

 Adjusted^b

1.00 (reference)

0.98 (0.77–1.26)

1.01 (0.72–1.41)

1.77 (1.05–2.97)

Urban setting—studies 1, 2, 3, 6, 7, 8, 10

  Not adjusted^a

1.00 (reference)

1.02 (0.87–1.21)

1.01 (0.80–1.28)

1.28 (0.81–2.02)

 Adjusted^b

1.00 (reference)

1.02 (0.87–1.21)

1.01 (0.80–1.28)

1.28 (0.81–2.02)

Calculated fields—studies 2, 4, 5, 6, 7, 10, 11

  Not adjusted^a

1.00 (reference)

0.95 (0.79–1.13)

0.98 (0.75–1.26)

1.16 (0.71–1.91)

  Adjusted^b

1.00 (reference)

0.95 (0.79–1.13)

1.00 (0.75–1.32)

1.23 (0.67–2.26)

Measured or calculated fields—studies 1, 2, 4, 5, 6, 7, 10, 11

 Not adjusted^a

 1.00 (reference)

0.95 (0.79–1.14)

0.97 (0.75–1.24)

1.32 (0.81–2.13)

  Adjusted^b

1.00 (reference)

0.95 (0.79–1.14)

0.98 (0.75–1.28)

1.47 (0.83–2.60)