Figure 3: Magnitude of changes in values for serum cross-linked N-telopeptide of type I collagen (NTX) and tartrate-resistant acid phosphatase 5b (TRAP) expressed as mean percent change compared to baseline at 1 day (D2), 3 days (D4), 1 week (W1), 2 weeks (W2), 3 weeks (W3), and 4 weeks (W4) after parathyroidectomy for secondary hyperparathyroidism. * 𝑃 < 0 . 0 0 1 by the Mann-Whitney Rank Sum Test.