The performance of a food frequency questionnaire (FFQ) with a 7-day diet diary in estimating nitrogen and potassium intake

Comment

Nick Day. Int J Epidemiol. 2002 Jun.

. 2002 Jun;31(3):692-3.

No abstract available

Comment on

Epidemiological assessment of diet: a comparison of a 7-day diary with a food frequency questionnaire using urinary markers of nitrogen, potassium and sodium.
Day N, McKeown N, Wong M, Welch A, Bingham S. Day N, et al. Int J Epidemiol. 2001 Apr;30(2):309-17. doi: 10.1093/ije/30.2.309. Int J Epidemiol. 2001. PMID: 11369735
Commentary: Dietary diaries versus food frequency questionnaires-a case of undigestible data.
Willett W. Willett W. Int J Epidemiol. 2001 Apr;30(2):317-9. doi: 10.1093/ije/30.2.317. Int J Epidemiol. 2001. PMID: 11369736 No abstract available.