. 2014 Jan 23;41(2):022901. doi: 10.1118/1.4862508

Table 4.

Intraobserver snake variability. Measurements from snakes initialized from three trials by one observer were regressed against one another. Longitudinal measurements showed more variation: D_LNG and D_PP had lower R² values than A_TRV and A_PP, and in general the slopes of the longitudinal models were farther from 1.

	Longitudinal diameter				Transverse area
	D_LNG		D_PP		A_TRV		A_PP
Trial	R²	Slope	R²	Slope	R²	Slope	R²	Slope
1–2	0.99	1.00	0.82	0.90	0.98	1.00	0.96	1.00
1–3	0.98	1.00	0.93	0.95	0.99	0.99	0.85	0.91
2–3	0.98	1.00	0.76	1.03	0.99	0.99	0.90	0.76
Average	0.98	1.00	0.84	0.96	0.99	0.99	0.90	0.89