Table 1.

Definition of the skeletal and dental variables

A/OLp	Sagittal position of the maxillary base
pg/OLp	Sagittal position of the mandibular base
co/OLp	Sagittal position of the condylar head
pg/OLp + co/OLp	Composite mandibular length
is/OLp—ii/OLp	Overjet
ms/OLp—mi/OLp	Molar relation (a positive value indicates a distal, a negative value indicates a mesial molar relationship)
is/OLp—A/OLp	Sagittal position of the maxillary central incisor within the maxilla
ii/OLp—pg/OLp	Sagittal position of the mandibular central incisor within the mandible
ms/OLp—A/OLp	Sagittal position of the maxillary permanent first molar within the maxilla
mi/OLp—pg/OLp	Sagittal position of the mandibular permanent fist molar within the mandible
co-pg	Total mandibular length
co-go	Mandibular ramus height
go-pg	Mandibular body length
nl/T-FMN line	Maxillary plane angle
ml/T-FMN line	Mandibular plane angle
nl-ml	Interbase relation
Additional measurements
ANB   Wits appraisal   Sum of Björk polygon angles (Sum of saddle, articular, and gonial angles)

OLp, occlusal line perpendicular