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Table 3 Representation of variables included in regression analyses of the EAGLE study

From: A regression model for risk difference estimation in population-based case–control studies clarifies gender differences in lung cancer risk of smokers and never smokers

Factor Representation Values
Pack-yearsa Continuous  
Female Categorical Male = 0
   Female = 1
Age Continuous Years
Education Trend None = 0
   Elementary = 1
   Middle school = 2
   High school or more = 3
Smoked cigars, pipes, cigarillos Categorical Never Smoked = 0
   Smoked = 1
ETS in the workplace Categorical No ETS = 0
   ETS = 1
High-risk occupationb Categorical No occupation = 0
   Occupation = 1
Average percent inhaled Trend Never smoker = 0
   <25% = 1
   25-49% = 2
   50-74% = 3
   75-100% = 4
Years since quitting Continuous Years
  1. ETS = Environmental tobacco smoke.
  2. a Average packs of cigarettes smoked per day x years smoked.
  3. b List A/B high-risk occupation for lung cancer.