Table 1.

Baseline characteristics of study participants

CharacteristiceGFR
<60 ml/min per 1.73 m2, n=25≥60 ml/min per 1.73 m2, n=44
Age, yrs62±1352±14
Sex
 Men19 (76)22 (50)
 Women6 (24)22 (50)
Race/ethnicity
 White13 (52)26 (59)
 Black9 (36)9 (21)
 Hispanic3 (12)7 (16)
 Asian02 (5)
Study site
 Massachusetts General Hospital15 (60)31 (70.5)
 University of Miami3 (12)11 (25)
 St. Louis University Hospital7 (28)2 (5)
Prevalent cardiovascular disease, %2512
Hypertension, %8344
Diabetes mellitus, %4219
Multivitamin use, %3311
Calcium supplement use, %07
BMI, kg/m233.1±6.931.7±5.3
Creatinine, mg/dl1.96±0.880.91±0.28
Cystatin C, mg/L0.78±0.241.77±0.58
eGFR, ml/min per 1.73 m240±13118±45
eGFR category, ml/min per 1.73 m2
 ≥60044 (100)
 45–599 (36)0
 30–4411 (44)0
 15–294 (16)0
 <151 (4)0
  • Cell contents are presented as n (%) or mean (±SDs). Prevalent cardiovascular disease refers to a history of coronary artery disease and/or myocardial infarction and/or coronary artery bypass grafting and/or congestive heart failure. Data were unavailable for 31 participants regarding diabetes status, 29 participants for multivitamin and calcium supplement use, and 32 participants regarding hypertension and prevalent cardiovascular disease status. Data were missing for BMI for 45 participants. BMI, body mass index.