Table 2. Description of patient population: Frequencies and proportions or medians and ranges for each outcome based on first measurement session.

Level	Outcome		Observer 1	Observer 2	Observer 3	Observer 4
Patient	Fracture present. N (%).		15 (30%)	12 (24%)	16 (32%)	14 (28%)
	Worst fracture grade. N (%).	Grade 0	35 (70%)	38 (76%)	34 (68%)	36 (72%)
		Grade 1	5 (10%)	6 (12%)	8 (16%)	9 (18%)
		Grade 2	4 (8%)	2 (4%)	5 (10%)	2 (4%)
		Grade 3	6 (12%)	4 (8%)	3 (6%)	3 (6%)
	Cumulative fracture grade. Median (range) *		2 (1–14)	2 (1–8)	2 (1–13)	2 (1–9)
Vertebral	Height loss (%). Median (range) * , **		35.6 (3.2–72.3)	38.2 (19.3–74.2)	29.3 (6.1–79.1)	33.0 (4.5–72.3)
	Fracture present. N (%).		25 (3.7%)	16 (2.3%)	29 (4.3%)	24 (3.6%)

^*Including only fractured vertebrae of patients classified as fractured.

^**Note that some vertebrae, classified as fractured on visual assessment,showed an absolute height loss of less than 15% upon caliper measurement.