Table 2. Intra- and Inter-reader Reliability – Reader Differences in Distances for Points Defining FH Plane.

	Intra-Reader Reliability(Distance d to First Reading)	Inter-Reader Reliability (Distance d to First Reading of Reader 1 as the Gold Standard)
	Reader 1	Reader 2	Reader 3	Reader 4	Reader 5
Left Porion
Mean (SD), mm	2.0 (1.4)	2.3 (1.9)	2.2 (2.0)	2.1 (1.6)	2.2 (2.0)
≤1 mm, %	18.6	18.6	23.3	20.9	25.6
≤2 mm, %	62.8	55.8	69.8	67.4	62.8
≤3 mm, %	79.1	83.7	81.4	81.4	79.1
≤4 mm, %	86.0	90.7	81.4	88.4	83.7
≤5 mm, %	93.0	90.7	88.4	90.7	90.7
Right Porion
Mean (SD), mm	2.4 (1.5)	2.9 (2.1)	2.3 (1.7)	2.0 (1.2)	2.2 (1.4)
≤1 mm, %	14.0	9.3	9.3	18.6	16.3
≤2 mm, %	46.5	41.9	53.5	58.1	53.5
≤3 mm, %	67.4	65.1	76.7	81.4	72.1
≤4 mm, %	83.7	76.7	88.4	90.7	90.7
≤5 mm, %	95.4	88.4	93.0	97.7	95.4
Left Orbitale
Mean (SD), mm	1.3 (0.9)	1.9 (1.0)	1.7 (1.0)	1.6 (0.8)	1.3 (0.8)
≤1 mm, %	37.2	16.3	25.6	20.9	30.2
≤2 mm, %	79.1	62.8	69.8	69.8	79.1
≤3 mm, %	97.7	83.7	90.7	95.4	97.7
≤4 mm, %	97.7	95.4	95.4	97.7	100.0
≤5 mm, %	100.0	97.7	100.0	100.0	100.0