Table 1 Main Characteristics of the Iohexol Population with BTP.

From: Beta Trace Protein does not outperform Creatinine and Cystatin C in estimating Glomerular Filtration Rate in Older Adults

Characteristics

Total Sample

Participants, n

566

Mean age, y (SD)

78.5 (±6.2)

Female, n (%)

242 (42.8)

Diabetes mellitus, n (%)1

136 (24.0)

Arterial hypertension, n (%)2

435 (76.9)

Body mass index, n (%)

<25 kg/m2

150 (26.5)

25–29.9 kg/m2

258 (45.6)

≥30 kg/m2

158 (27.9)

Mean BSA (range), m2

1.85 (1.4–2.4)

Mean serum BTP (range), mg/L

0.75 (0.32–4.25)

Mean serum creatinine level (range) µmol/L mg/dl

87.9 (40.7–421.7) 0.99 (0.46–4.77)

Mean serum cystatin C level (range) mg/L

1.14 (0.61–4.40)

Mean hemoglobin (range), g/dl3

13.6 (9.5–19.1)

Mean albumin (range), g/L4

40.3 (30.8–51.9)

Mean c-reactive protein (range), mg/L5

3.40 (0.23–44.21)

Mean mGFR (range) ml/min/1.73 m2

60.4 (15.5–116.7)

Mean eGFRPöge_BTP (range) ml/min/1.73 m2

63.9 (15.0–116.5)

Mean eGFRPöge_BTP/Crea (range) ml/min/1.73 m2

62.8 (13.4–111.8)

Mean eGFRInker_BTP ml/min/1.73 m2

58.4 (15.5–105.0)

Mean eGFRWhite_BTP/Crea ml/min/1.73 m2

86.24 (14.2–163.0)

  1. mGFR = measured glomerular filtration rate; 1Diabetes was defined as either HbA1c >6.5%, and/or prescription of antidiabetic medication. 2Hypertension was defined as prescription of antihypertensive medication. 3To convert cystatin C from mg/L to nmol/L, multiply by 74.9; 4To convert hemoglobin from mmol/L to g/dL, divide by 0.621; 5To convert albumin from g/L to g/dL, multiply by 0.1; 6To convert C - reactive protein from mg/L to mg/dL, multiply by 0.1.
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