Table 2A

Continued

Environmental factors
 Cigarette smoking
  Never248811031.01.0
  Former10043581.31 (0.84–2.02)1.37 (0.92–2.05)0.95 (0.58–1.55)
  Current11335510.95 (0.60–1.50)1.11 (0.74–1.66)0.86 (0.51–1.44)
 Duration of smokingb (pack-years)
  <56927361.23 (0.74–2.06)1.30 (0.81–2.07)0.95 (0.53–1.70)
  5–157324361.03 (0.60–1.72)1.20 (0.76–1.91)0.84 (0.47–1.53)
  ≥167127371.12 (0.67–1.87)1.21 (0.76–1.92)0.93 (0.52–1.65)
 Age started smokingb (in years)
  8–166615210.71 (0.38–1.31)0.78 (0.45–1.34)0.91 (0.44–1.87)
  16–175521331.18 (0.67–2.07)1.48 (0.90–2.42)0.80 (0.43–1.48)
  ≥189242551.37 (0.88–2.14)1.41 (0.94–2.13)0.97 (0.59–1.60)
 Alcohol use (drinks/week)
  None1978721.01.0
  <7227751190.95 (0.65–1.40)1.43 (1.0–2.04)0.67 (0.43–1.03)
  ≥73816211.24 (0.65–2.36)1.54 (0.84–2.80)0.81 (0.39–1.67)
 Electric blanket and mattress pad use
  Never3251001411.01.0
  Ever13759711.38 (0.95–2.03)1.17 (0.83–1.66)1.18 (0.77–1.82)
 Electric blanket and mattress pad use (in months)
  Never3251001411.01.0
  1–94121191.65 (0.93–2.92)1.04 (0.58–1.86)1.58 (0.81–3.10)
  10–294613310.92 (0.48–1.77)1.54 (0.94–2.54)0.59 (0.30–1.19)
  ≥305025211.60 (0.94–2.73)0.94 (0.54–1.63)1.70 (0.90–3.21)
  • a Relative to never users.

  • b Relative to never smokers.