Table 2.

Coefficient of variation (CV) for different ROIs. n = 126 double examinations in ROIs 1–3. CV for Gruen zones 1–7. n = 136 double examinations in zones 1–3 and zones 5–7. n = 130 double examinations in zone 4. DEXA scans were performed at a mean of 7 (4–31) days postoperatively

	ROI			Gruen zone
	1	2	3	1	2	3	4	5	6	7
CV (%)	2.2	2.7	4.1	1.6	1.4	1.6	1.2	1.6	2.1	2.1