Endoscopic identification of endoluminal esophageal landmarks for radial and longitudinal orientation and lesion location

Table 1 Morphometric characteristics of patients

Factor	Study (n = 207), mean ± SD (CV)	Sub-study (n = 25), mean ± SD (CV)
Age (yr)	54 ± 10 (0.2)	64 ± 14 (0.2)
Height (cm)	162 ± 9 (0.05)	169 ± 8 (0.05)
Weight (kg)	66 ± 12 (0.18)	78 ± 16 (0.21)
BMI	25 ± 4 (0.16)	27 ± 4 (0.17)

SD: Standard deviation; CV: Coefficient of variation.

Table 2 Landmark distance from the incisors

Landmark	Study (n = 207)	Sub-study (n = 25)		P value	Power to detect differences > 4.5% (confidence 95%)
	WL, mean ± SD (CV)	WL, mean ± SD (CV)	EUS, mean ± SD (CV)
Left main bronchus	25.8 ± 2.3 (0.09)	25.4 ± 2.1 (0.08)	26.7 ± 1.9 (0.07)	0.16	82.9%
Left atrium	31.4 ± 2.4 (0.08)	30.5 ± 1.9 (0.06)	31.6 ± 2.3 (0.07)	0.1	80.1%

One-way ANOVA test with P < 0.05 considered significant. Mean distances are expressed in cm. SD: Standard deviation; CV: Coefficient of variation.