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, 12:52, 29 May 2013
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| *Cohort | | *Cohort |
| *Genetic principle components (alternatively could use empirical kinships in rare-metal-worker) | | *Genetic principle components (alternatively could use empirical kinships in rare-metal-worker) |
− | *Adolescence versus adulthood (e.g., < 21 years of age versus >=21) | + | *Adolescence versus adulthood (e.g., < 21 years of age versus >=21). Only consider using this covariate if you have a large number of adolescents in your study. |
| *Date of assessment (e.g., the calendar year of the assessment)? | | *Date of assessment (e.g., the calendar year of the assessment)? |
| *Current versus former smoker for smoking phenotypes. This would be a binary covariate. | | *Current versus former smoker for smoking phenotypes. This would be a binary covariate. |