Table 1. Patient characteristicsa

Combined125I-Iothalamate99mTc-DTPA
a Results expressed as mean ± SD (range) or n (%).
b P < 0.05 for iothalamate versus 99mTc-DTPA group.
Sample size1005545
Age (yr)41 ± 10 (18–62)42 ± 10 (21–62)40 ± 10 (18–61)
Male gender42 (42%)21 (38%)21 (47%)
Black raceb10 (10%)9 (16%)1 (2%)
Weight (kg)b78.1 ± 15.7 (44.1–113.0)75.3 ± 15.7 (44.1–107.3)81.5 ± 15.3 (46–113)
Height (cm)168.5 ± 9.4 (142.5–193.0)168.8 ± 9.2 (154.9–193.0)168.1 ± 9.8 (142.5–190)
Body surface area (m2)1.9 ± 0.2 (1.4–2.4)1.9 ± 0.2 (1.4–2.4)1.9 ± 0.2 (1.4–2.3)
Serum creatinine (mg/dl)0.9 ± 0.2 (0.5–1.3)0.8 ± 0.2 (0.5–1.2)0.9 ± 0.2 (0.5–1.3)
Serum urea nitrogen (mg/dl)13 ± 4 (5–31)13 ± 4 (6–31)13 ± 4 (5–26)
Albumin (gm/dl)b4.5 ± 0.5 (3.3–5.4)4.5 ± 0.4 (3.7–5.4)4.3 ± 0.5 (3.3–5.4)
Measured GFR (ml/min per 1.73 m2)b112.8 ± 21.0 (70.0–169.0)102.8 ± 15.8 (70.0–151.9)125.1 ± 20.3 (77.–169.0)