Relative Validity of a Beverage Frequency Questionnaire Used to Assess Fluid Intake in the Autosomal Dominant Polycystic Kidney Disease Population
by
Carly Mannix 1,2,*
, Anna Rangan 3, Annette Wong 1,2, Jennifer Zhang 1,2, Margaret Allman-Farinelli 3 and Gopala Rangan 1,2
Carly Mannix 1,2,*, Anna Rangan 3, Annette Wong 1,2, Jennifer Zhang 1,2, Margaret Allman-Farinelli 3 and Gopala Rangan 1,2
1
Centre for Transplant and Renal Research, The Westmead Institute for Medical Research, The University of Sydney, Westmead, NSW 2145, Australia
2
Department of Renal Medicine, Westmead Hospital, Western Sydney Local Health District, Westmead, NSW 2145, Australia
3
School of Life and Environmental Sciences, The Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia
*
Author to whom correspondence should be addressed.
Nutrients 2018, 10(8), 1051; https://doi.org/10.3390/nu10081051
Received: 23 July 2018 / Revised: 6 August 2018 / Accepted: 7 August 2018 / Published: 9 August 2018
Maintaining hydration sufficient to reduce levels of arginine vasopressin has been hypothesised to slow kidney cyst growth in autosomal dominant polycystic kidney disease (ADPKD). The semi-quantitative beverage frequency questionnaire (BFQ) was designed to measure usual fluid intake over the past month. The aim of this study was to assess the validity and reliability of the BFQ compared with the 24-h urine biomarkers. Participants with ADPKD (18–67 years; estimated glomerular filtration rate (eGFR) ≥ 30 mL/min1.73 m2) completed the BFQ. Serum creatinine, eGFR, 24-h urine volume, and osmolality were measured. Pearson correlation coefficients, paired t test, and Bland–Altman plots were used to evaluate agreement between the methods. A subset repeated the BFQ to assess reliability. A total of 121 participants (54% male, 43 ± 11 years; mean ± SD) completed the BFQ and at least one 24-h urine collection. The correlation between the BFQ and the 24-h urine volume was moderate (r = 0.580) and weaker with the 24-h urine osmolality (r = −0.276). The Bland–Altman plots revealed good agreement between the BFQ and the 24-h urine volume with no obvious bias; however, the limits of agreement were wide (−1517–1943 mL). The BFQ1 and BFQ2 were strongly correlated (r = 0.799, p < 0.001) and were not significantly different (p = 0.598). The BFQ is a valid and reliable tool to assess the usual fluid intake of the ADPKD population.
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Keywords:
fluid intake; hydration; kidney; polycystic kidney disease; questionnaire
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MDPI and ACS Style
Mannix, C.; Rangan, A.; Wong, A.; Zhang, J.; Allman-Farinelli, M.; Rangan, G. Relative Validity of a Beverage Frequency Questionnaire Used to Assess Fluid Intake in the Autosomal Dominant Polycystic Kidney Disease Population. Nutrients 2018, 10, 1051.
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