Vitamin D Status in Patients Operated for Primary Hyperparathyroidism: Comparison of Patients from Southern and Northern Europe

Table 4

Change in bone mineral density (Δ) after surgery for primary hyperparathyroidism. Change in absolute values in percent. Change in 𝑧-score in arithmetic difference. Medians (IQR). Kruskal-Wallis test.

BMD site	Spanish cohort	Swedish cohort	P
ΔLumbar spine, absolute	4.2 (1.0–6.9)	1.3 (−0.9–6.8)	0.009
ΔLumbar spine, 𝑧-score	0.4 (0.2–0.6)	0.2 (0.0–0.6)	0.18
ΔFemoral neck, absolute	2.8 (−0.9–7.3)	2.1 (−1.1–5.8)	0.46
ΔFemoral neck, 𝑧-score	0.3 (0.0–0.5)	0.1 (−0.1–0.4)	0.004
ΔTotal hip, absolute	2.8 (−0.3–5.7)	1.9 (0.6–4.2)	0.09
ΔTotal hip 𝑧-score	0.3 (0.1–0.5)	0.2 (0.1–0.4)	0.05