Table 2.

Participants, characteristics^*

Subjects (n)	431
Age (year)	69.9 ± 6.8
Male sex (n [%])	233 (54.1)
Diabetes (n [%])	263 (61.0)
Body mass index (kg/m2)	24.2 ± 4.3
Body surface area (m2)	1.66 ± 0.19
Serum creatinine (mg/dL)	2.0 ± 1.9
Serum cystatin C (mg/dL)	2.0 ± 1.2
Measured GFR (mL/minute/1.73 m2)	53.4 ± 26.9
GFR categories
<15 (mL/minute/1.73 m2)	33 (7.7)
15–29 (mL/minute/1.73 m2)	59 (13.7)
30–59 (mL/minute/1.73 m2)	174 (40.4)
60–89 (mL/minute/1.73 m2)	118 (27.4)
>90 (mL/minute/1.73 m2)	47 (10.9)

Note:

^*Plus-minus values are means ± standard deviation.

Abbreviation: GFR, glomerular filtration rate.