Table 4

Cox's proportional hazards model for relation between exposure to environmental tobacco smoke in childhood and risk of lung cancer in whole cohort in 60 182 people who have never smoked

Exposure to ETS in infancyWhole cohortNo of casesHR* (95% CI)
Never (reference)29 164151.0
Seldom12 37681.08 (0.45 to 2.59)
Few times/week8 36071.45 (0.59 to 3.61)
Daily8 06382.04 (0.85 to 4.94)
Daily, many hours2 21943.63 (1.19 to 11.11)
  • * Adjusted for sex, country, education, vegetables, fruit, total energy, physical activity. P value for trend 0.018.