Intra-operator (repeatability) variability of the ultrasound thyroid linear and cross-sectional area measurements.

aThe maximum transverse dimension of the thyroid gland.bThe maximum longitudinal scan plane of the left thyroid lobe.cThe longitudinal scan plane of the left thyroid lobe.dThe maximum longitudinal scan plane of the right thyroid lobe.eThe oblique scan plane of the left thyroid lobe.fThe oblique scan plane of the right thyroid lobe.gLength; craniocaudal dimension.hHeight; dorsoventral dimension.iWidth; mediolateral dimension.jCross-sectional area.kIntraclass Correlation Coefficient.lConfidence Interval.mPortable ultrasound unit.nFully-equipped clinical ultrasound unit.