Table 2 Pearson correlation analyses of eGFR at baseline with selected variables at follow-up.

Baseline eGFR	All (N = 401)		Normal weight (N = 283)		Overweight (N = 118)
Follow-up	r	p value	r	p value	r	p value
Age (years)	0.334	< 0.0001	0.239	< 0.0001	0.450	< 0.0001
BMI-SDS	0.120	0.01	− 0.013	NS	0.215	0.02
Height-SDS	0.006	NS	− 0.048	NS	0.010	NS
Weight-SDS	0.112	0.02	− 0.035	NS	0.224	0.01
Waist (cm)	0.151	0.003	0.010	NS	0.341	< 0.0001
SBP (mmHg)	0.315	< 0.0001	0.249	< 0.0001	0.420	< 0.0001
DBP (mmHg)	0.219	< 0.0001	0.221	< 0.0001	0.141	NS
Glucose (mg/dL)	− 0.084	NS	− 0.100	NS	− 0.056	NS
Creatinine (mg/dl)	− 0.205	< 0.0001	− 0.314	< 0.0001	− 0.123	NS
Insulin (µU/mL)	0.354	< 0.0001	0.341	< 0.0001	0.346	< 0.0001
HOMA-IR	0.341	< 0.0001	0.324	< 0.0001	0.327	< 0.0001
HDL-cholesterol (mg/dL)	0.056	NS	0.135	0.02	− 0.032	NS
LDL-cholesterol (mg/dL)	0.091	NS	0.075	NS	0.138	NS
Total cholesterol (mg/dL)	− 0.110	0.024	− 0.119	0.04	− 0.026	NS
Triacylglycerol (mg/dL)	0.067	NS	0.024	NS	0.037	NS
Renal length (cm)	0.317	< 0.0001	0.205	0.001	0.463	< 0.0001
Renal volume (cm³)	0.372	<0.0001	0.259	<0.0001	0.536	<0.0001

BMI body mass index, SBP systolic blood pressure, DBP diastolic blood pressure, eGFR estimated glomerular filtration rate, HOMA-IR homeostatic model assessment of insulin resistance, NS non-significant.
Moderate associations (Pearson’s r > 0.3) are shown in bold.

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