Pre-op

6 mo-post

2 yr-post

P

Serum creatinine (μmol/L)

76.90 ± 16.91

112.40 ± 81.32

82.80 ± 14.77

0.236

Urea nitrogen (g/L)

4.11 ± 1.05

4.78 ± 0.98

4.03 ± 1.05

0.776