Normal radiological anatomy of thyroid cartilage in 600 Chinese individuals: implications for anterior cervical spine surgery

Table 2 Measurement reliability statistics for various radiographic values

	Kappa	ICC	Inter-rater reliability
CLCEP	0.9		Excellent
Transverse diameter of thyroid cartilage of SBTC (D1)		0.8	Good
Transverse diameter of vertebral body or intervertebral disc of SBTC (V1)		0.8	Good
Transverse diameter of thyroid cartilage of IBTC (D2)		0.9	Excellent
Transverse diameter of vertebral body or intervertebral disc of IBTC (V2)		0.7	Good
Transverse diameter of trachea of IBCC (D3)		0.9	Excellent
Transverse diameter of vertebral body or intervertebral disc of IBCC (V3)		0.9	Excellent

CLCEP cervical level corresponding to each plane, SBTC plane of superior border of the thyroid cartilage, IBTC plane of inferior border of the thyroid cartilage, IBCC plane of inferior border of the cricoid cartilage, ICC intra-class correlation coefficient

ISSN: 1749-799X