Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Sensitivity and specificity of the short food frequency questionnaire for use of butter on bread, cod liver oil and vitamin supplements
| Sensitivity (%) | Specificity (%) | ||
|---|---|---|---|
| 9-year-olds | Butter on bread | 89 | 72 |
| Cod liver oil | 87 | 83 | |
| Vitamin supplements | 79 | 73 | |
| 13-year-olds | Butter on bread | 82 | 69 |
| Cod liver oil | 76 | 83 | |
| Vitamin supplements | 84 | 66 |
