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Trends in Prevalence of Self-Reported Physical Activity among U.S. Adults, by CKD

Trends in Prevalence of Self-Reported Physical Activity among U.S. Adults, by CKD

The overall crude prevalence of physical activity among adults in the general population was higher during 2017–March 2020 than during 2001–2004 (76.5% and 66.1% respectively). Among adults with CKD, the prevalence of physical activity was lower than in the general population but trended higher over time.

Data Source: NHANES


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Data includes CKD stages 1–5. Data are not adjusted.

NHANES is a nationally representative, cross-sectional survey that is currently conducted every two years (since 1999) by CDC's National Center for Health Statistics among noninstitutionalized US civilian residents. The survey consists of a standardized in-home interview and a physical examination with blood and urine collected at a mobile examination center. Data were examined by combining two NHANES cycles to represent four-year periods from 2001 to 2016 and the 2017–March 2020 pre-pandemic cycle. 

Note: Not all NHANES variables are collected for all years; therefore, some NHANES indicators may not utilize the full 20-year span.

Description of Measure

Prevalence of self-reported physical activity among U.S. Adults, by CKD.

Data Set

National Health and Nutrition Examination Survey (NHANES).


Noninstitutionalized U.S. adults aged ≥ 18 years, pregnant women excluded.

Years Included

2001–March 2020.


Adults aged ≥ 18 years who reported being moderately or vigorously active. See below for details.


Adults aged ≥ 18 years with serum creatinine, urine albumin, diabetes, blood pressure, and physical activity measurements.

Definition of CKD

CKD is defined by estimated glomerular filtration rate (eGFR) < 60 ml/min/1.73 m² or albuminuria (urine albumin to creatinine ratio [UACR] ≥ 30 mg/g). Estimates are based on single estimates of eGFR and UACR.

Estimated glomerular filtration rate (eGFR)

Based on the CKD-EPI (2021) equation for calibrated creatinine: eGFR=142 x [min(serum creatinine in mg/dL) /κ, 1)]**α x [max(serum creatinine/κ, 1)]**-1.20 x 0.9938**age x (1.012 if female).

κ = 0.7 if female and 0.9 if male
α = -0.241 if female and -0.302 if male
** = raise to the power


UACR is calculated as urine albumin divided by urine creatinine. Albuminuria is defined as UACR ≥ 30 mg/g.

Serum Creatinine

Serum creatinine values used for eGFR calculation are standardized against isotope dilution mass spectrometry (IDMS).

Urine Albumin

Measured in random urine collection by fluorescent immunoassay.

Physical Activity

Physical activity is defined as self-reporting recreational (sports, fitness, or recreational activities) or work activity (paid work, unpaid work, household chores, or yard work) that causes large (vigorous activity) or small (moderate activity) increases in breathing or heart rate and is done for at least 10 minutes continuously during a typical week.

Limitations of Indicator

Physical activity, albuminuria and kidney function are assessed from one-time cross-sectional measurements, possibly overestimating prevalence. 

Analytical Considerations

Appropriate NHANES survey weights are used for all analyses; if relative standard error is greater than 30% of the estimate, the estimates are not shown. Serum creatinine measurements are assay corrected for NHANES years 2005 and 2006 and prior to be combined with later years.