Table 1.
Number and examples of nutrition and lifestyle factors in NHANES III
| Factor category | Number of variables† | Examples |
|---|---|---|
| Nutrition | ||
| Food nutrient recall | 104 | Dietary fibre (continuous) |
| Aspartame (continuous) | ||
| Energy from protein (continuous) | ||
| Healthy Eating Index (HEI) | 10 | Total HEI score (continuous) |
| Nutrients and minerals (serum and urine) | 17 | Serum vitamin A (continuous) Serum selenium (continuous) |
| Alcohol use | 1 | Drink alcohol twice or more a day (yes/no) |
| Caffeinated beverages | 1 | Drink caffeinated beverages twice or more a day (yes/no) |
| Lifestyle factors | ||
| Personal smoking | 14 | Current smoker (reference: never smoker) |
| Ever smoked 20 cigars in life (yes/no) | ||
| Serum cotinine (continuous) | ||
| Environmental smoking | 4 | Does anyone smoke in the home (yes/no) |
| At work, hours per day can smell smoking (ordinal) | ||
| Physical activity | 1 | Vigorous physical activity (yes/no) |
| Social support | 2 | How many times talking on the phone with family, friends or neighbors per week (ordinal) |
| Environmental pollutants | 2 | Serum lead (continuous) |
| Urine cadmium (continuous) | ||
| Bacterial infection | 2 | Helicobacter pylory antibody (continuous) |
| Viral infection | 8 | Herpes Simplex Virus I antibody (positive/negative) |
| Hepatitis A antibody (positive/negative) | ||
| Parasite infection | 1 | Toxoplasma antibody (continuous) |
| Painkiller use | 6 | Taken aspirin in the past month (yes/no) |
| # NSAIDs taken in the past month (ordinal) |
†
This table summarizes the number of variables available for each factor category from the Supplementary Table S1 (e.g. there were 104 available variables under the Nutrition category, and 10 variables to define the Healthy Eating Index).