Table 2: Clinical characteristics of SOF participants by CKD- eGFR category.

Baseline characteristicsOverall
()
CKD- eGFR category (mL/min/1.73 m2) value
≥7560 to 7445–59<45
()()()()

Age, years, mean (SD)79.5 (4.6)77.7 (4.1)79.4 (4.2)81.3 (4.8)82.0 (4.8)<0.001
Race/ethnicity, (%)<0.001
 White1159 (89.9)355 (82.2)399 (92.8)270 (95.1)135 (94.4)
 Black130 (10.1)77 (17.8)31 (7.2)14 (4.9)8 (5.6)
Education, (%)0.031
 Less than high school229 (17.8)62 (14.4)69 (16.1)65 (23.0)33 (23.1)
 High school538 (41.8)190 (44.1)182 (42.4)116 (41.0)50 (35.0)
 College/grad school519 (40.4)179 (41.5)178 (41.5)102 (36.0)60 (42.0)
Body mass index, kg/m2, mean (SD)26.8 (5.0)26.1 (4.9)27.1 (5.0)27.0 (4.8)27.4 (5.2)0.008
Current smoker, (%)58 (4.5)27 (6.3)15 (3.5)12 (4.2)4 (2.8)0.167
Self-rated health good/excellent, (%)1035 (80.4)366 (84.7)357 (83.0)217 (76.4)95 (66.9)<0.001
Hypertension, (%)795 (61.7)235 (54.4)242 (56.3)196 (69.0)122 (85.3)<0.001
Diabetes mellitus, (%)95 (7.4)33 (7.6)23 (5.4)23 (8.1)16 (11.3)0.112
Self-reported stroke, (%)60 (4.7)18 (4.2)10 (2.3)20 (7.0)12 (8.5)0.003
Self-reported coronary heart disease, (%)246 (19.1)73 (16.9)67 (15.6)62 (21.8)44 (31.0)<0.001
Self-reported congestive heart failure, (%)65 (5.1)21 (4.9)12 (2.8)20 (7.0)12 (8.5)0.016
CKD- eGFR, mean (SD)66.7 (16.7)84.6 (7.1)67.6 (4.2)53.5 (4.1)36.3 (7.2)<0.001
Follow-up time, years, mean (SD)9.2 (4.0)10.2 (3.8)9.6 (3.9)8.3 (4.0)6.8 (4.1)<0.001

eGFR, estimated glomerular filtration rate; CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; cr, creatinine; cysc, cystatin C.
As determined by self-report or any disease-specific medication use.
Coronary heart disease includes myocardial infarction, angina, and other heart diseases.