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. 2014 Mar 30;2014(3):CD005195. doi: 10.1002/14651858.CD005195.pub3

Comstock 1997

Methods Matched, nested case‐control study
Country: US
Participants Participants: number of participants n.r.; both genders Inclusion criteria: residents of Washington County Name of parent cohort: CLUE I and II Cohort
Recruitment: 1974/75 or 1989 Outcome assessment: n.r.
Number of cases: Lung cancer: 258 (male/female: 157/101)
Case definition: incidence
Years of follow‐up: n.r.
Type of selenium marker: serum/plasma
Interventions d.n.a.
Outcomes Statistical methods: conditional logistic regression Variables controlled by matching: age, gender, race/ethnicity, year and month of sample collection, participant of Clue I or Clue II cohort
Risk estimates [95% CI] Reference category: lowest quintile
Results: Lung cancer   both genders: highest quintile: OR 0.65 (CI not reported)
Selenium levels in exposure categories n.r.
Notes