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

Table 1. Intra-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	30	0.6 (0.1–1.3)	0.8 (0.2–1.7)	0.6 (0.2–1.4)	0.997 (0.994–0.998)
Ultrasound (COL method)	R2	30	0.7 (0.1–2.1)	1.0 (0.2–2.7)	0.8 (0.1–2.2)	0.993 (0.986–0.996)
MRI (Cobb method)	R1	30	0.5 (0.2–1.2)	0.7 (0.2–1.6)	0.5 (0.2–1.3)	0.998 (0.996–0.999)
MRI (Cobb method)	R2	30	0.6 (0.1–1.1)	0.8 (0.2–1.5)	0.7 (0.1–1.2)	0.997 (0.994–0.998)

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.