highly significantP < 0.001
The difference versus patients at CKD stage 1 progressively increased and became highly significant in patients with lower GFR ( P < 0.001 at stage 3a, P < 0.0001 at stages 3b, 4, and 5).
The difference versus patients at CKD stage 1 progressively increased and became highly significant in patients with lower GFR ( P < 0.001 at stage 3a, P < 0.0001 at stages 3b, 4, and 5).
Hence, there may be significant inter and intralaboratory variation.