Abstract
While obesity is a recognized risk factor for chronic kidney disease, it remains unclear
whether change in body mass index (ΔBMI ) is independently associated with decline
in renal function (evaluated by the change in estimated glomerular filtration rate,
ΔeGFR) over time. Accordingly, to help clarify this we conducted a retrospective study
to measure the association of ΔBMI with decline in renal function in Chinese adult
population. A total of 4007 adults (aged 45.3±13.7 years, 68.6% male) without chronic
kidney disease at baseline were enrolled between 2008 and 2013. Logistic regression
models were applied to explore the relationships between baseline BMI and ΔBMI, and
rapid decline in renal function (defined as the lowest quartile of ΔeGFR ). During
5 years of follow-up, the ΔBMI and ΔeGFR were 0.47±1.6 (kg/m2) and –3.0±8.8 (ml/min/1.73 m2), respectively. After adjusted for potential confounders, ΔBMI (per 1 kg/m2 increase) was independently associated with the rapid decline in renal function [with
a fully adjusted OR of 1.12 (95% CI, 1.05 to 1.20). By contrast, the baseline BMI
was not associated with rapid decline in renal function [OR=1.05 (95% CI, 0.98 to
1.13)]. The results were robust among 2948 hypertension-free and diabetes-free participants,
the adjusted ORs of ΔBMI and baseline BMI were 1.14 (95% CI, 1.05 to 1.23) and 1.0
(95% CI, 0.96 to 1.04) for rapid decline in renal function, respectively. The study
revealed that increasing ΔBMI predicts rapid decline in renal function.
Key words
body mass index - renal function - proteinuria - estimated glomerular filtration rate
- epidemiology