Clinical Trial: Dietary Phosphate and Serum Phosphorus

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

Official Title: Nutrition Risk Screening in Chronic Kidney Disease (CKD) From the National Health and Nutrition Examination Survey

Brief Summary: Overall study design is to review National Health and Nutrition Examination Survey (NHANES) data 1999-2008 for nutrition risk according to kidney function. Substudies will be performed to review the association of nutrients and overall dietary intake compared to biomarkers available in NHANES during this period.

Detailed Summary:

Data from NHANES 2003-2006 were used to evaluate the relationship between estimated dietary phosphorus intake and the measured serum phosphorus. The following variables were used:

  1. Demographics: Age, sex, race/ethnicity
  2. Dietary variables: Foods, food groups (as reported by the United States Department of Agriculture (USDA) method, further standardized to the Academy of Nutrition and Dietetics method for portion size and then divided into groups having inorganic phosphate additives or no inorganic phosphate additives), food weight (g), phosphorus (mg), dietary supplements
  3. Socioeconomic variables: education, family income
  4. Laboratory variables: serum creatinine, phosphorus; urine albumin, creatinine
  5. Clinical assessments: hypertension (proportion having blood pressure ≥140 millimeters of mercury (mmHg) diastolic or ≥90 mmHg systolic or taking antihypertensive medications); hyperglycemia (proportion having serum glucose >126 mg/dL or taking medications for diabetes); kidney function based on Chronic Kidney Disease Epidemiology Collaboration (2009) equation, evaluated in 15 milliliters/min/1.73m2 increments from <15 to >105; anthropometrics (BMI, kg/m2; obesity class I, II, III)

Sponsor: The Methodist Hospital System

Current Primary Outcome: Serum phosphorus concentration [ Time Frame: approximately 24 hours ]

Serum phosphorus concentration on the day that 24-hour dietary recall was obtained (reflecting dietary intake the day prior to blood draw); measured in mg/dL


Original Primary Outcome: Same as current

Current Secondary Outcome: Kidney function level [ Time Frame: Baseline ]

Kidney function estimated from Chronic Kidney Disease Epidemiology Collaboration (2009) equation, mL/min/1.73m2, and separated into 15mL/min increments


Original Secondary Outcome: Same as current

Information By: The Methodist Hospital System

Dates:
Date Received: April 22, 2015
Date Started: January 2003
Date Completion:
Last Updated: March 15, 2016
Last Verified: March 2016