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- Title
Validation of a Phosphorus Food Frequency Questionnaire in Patients with Kidney Failure Undertaking Dialysis.
- Authors
Beer, Joanne; Lambert, Kelly; Lim, Wai; Bettridge, Ellen; Woodward, Fiona; Boudville, Neil
- Abstract
Nutritional guidelines recommended limiting dietary phosphorus as part of phosphorus management in patients with kidney failure. Currently, there is no validated phosphorus food frequency questionnaire (P-FFQ) to easily capture this nutrient intake. An FFQ of this type would facilitate efficient screening of dietary sources of phosphorus and assist in developing a patient-centered treatment plan. The objectives of this study were to develop and validate a P-FFQ by comparing it with the 24 hr multi-pass recall. Fifty participants (66% male, age 70 ± 13.3 years) with kidney failure undertaking dialysis were recruited from hospital nephrology outpatient departments. All participants completed the P-FFQ and 24 hr multi-pass recalls with assistance from a renal dietitian and then analysed using nutrient analysis software. Bland–Altman analyses were used to determine the agreement between P-FFQ and mean phosphorus intake from three 24 hr multi-pass recalls. Mean phosphorous intake was 1262 ± 400 mg as determined by the 24 hr multi pass recalls and 1220 ± 348 mg as determined by the P-FFQ. There was a moderate correlation between the P-FFQ and 24 hr multi pass recall (r = 0.62, p = 0.37) with a mean difference of 42 mg (95% limits of agreement: 685 mg; −601 mg, p = 0.373) between the two methods. The precision of the P-FFQ was 3.33%, indicating suitability as an alternative to the 24 hr multi pass recall technique. These findings indicate that the P-FFQ is a valid, accurate, and precise tool for assessing sources of dietary phosphorus in people with kidney failure undertaking dialysis and could be used as a tool to help identify potentially problematic areas of dietary intake in those who may have a high serum phosphate.
- Subjects
FOOD habits; RESEARCH methodology evaluation; KIDNEY failure; PHOSPHORUS; RESEARCH methodology; FOOD consumption; NUTRITIONAL requirements; PATIENT-centered care; KIDNEY diseases; DIET therapy; COMPARATIVE studies; QUESTIONNAIRES; HEMODIALYSIS; OUTPATIENT services in hospitals; NUTRITION policy; EVALUATION
- Publication
Nutrients, 2023, Vol 15, Issue 7, p1711
- ISSN
2072-6643
- Publication type
Article
- DOI
10.3390/nu15071711