. 2015 Aug 12;10(8):e0135264. doi: 10.1371/journal.pone.0135264

Table 2. Inter-rater variation and reliability of coronal curvature assessments using ultrasound compared with MRI.

Methods	Raters	Curves, n	MAD^a (°)	SD^b (°)	SEM^c (°)	ICC[2,k] (95%CI)^d
Ultrasound (COL method)	R1 vs. R2	30	0.9(0.4–1.4)	1.1 (0.5–2.2)	1.0 (0.5–2.0)	0.995 (0.989–0.998)
MRI (Cobb method)	R1 vs. R2	30	0.8 (0.3–1.8)	1.1 (0.4–2.2)	1.0 (0.3–2.0)	0.995 (0.989–0.998)

MAD^a: mean absolute difference; SD^b: standard deviation; SEM^c: standard error of measurement; ICC^d: intra-class correlation coefficient; CI^d: confidence intervals