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The Variables in the Myopic Change Example. The Fourth Column Shows which Direction Is Risky
| code | variable | unit | higher risk |
|---|---|---|---|
| sex | sex | Male | |
| inc | income | $1000 | <30 |
| jomyop | juvenile myopia | age first wore glasses for distance | yes before age 21 |
| catct | nuclear cataract | severity 1–5 | 4–5 |
| pky | packyear | pack per day × years smoked | >30 |
| asa | aspirin | taking/not taking | not taking |
| vtm | vitamins | taking/not taking | not taking |
