S1 File -

Table S1. Characteristics of the study population.

¹ Median and interquartile range.

Table S2. Contingency table including numbers and percentages (of total) of included dogs’ CM and SM classifications (grey = abnormal, white = normal)..

CM, Chiari-like malformation; SM, syringomyelia.

Table S3. Group means for CT-based measurements for CM normal versus abnormal..

¹Standard deviation, * based on 72 pairs of measurements, ** based on 53 pairs of measurementsAll measurements are in centimeters. Ratio 1: Interpupillary distance: intercanthal distance; Ratio 2: Circumference of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 1); Ratio 3: Maximum width of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 2); Ratio 4: Length of the dorsal aspect of the nose from the planum to the stop (muzzle length): Distance from the stop to the external occipital protuberance following the skull borders (CT-based craniofacial ratio); Ratio 5: Length of the dorsal aspect of the nose from the planum to the stop: Length of the mandible.

Table S4. Group means for CT-based measurements for SM normal versus abnormal..

¹Standard deviation, * based on 72 pairs of measurements, ** based on 53 pairs of measurementsAll measurements are in centimeters. Ratio 1: Interpupillary distance: intercanthal distance; Ratio 2: Circumference of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 1); Ratio 3: Maximum width of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 2); Ratio 4: Length of the dorsal aspect of the nose from the planum to the stop (muzzle length): Distance from the stop to the external occipital protuberance following the skull borders (CT-based craniofacial ratio); Ratio 5: Length of the dorsal aspect of the nose from the planum to the stop: Length of the mandible.

Table S1. Characteristics of the study population.

¹ Median and interquartile range.

Table S2. Contingency table including numbers and percentages (of total) of included dogs’ CM and SM classifications (grey = abnormal, white = normal)..

CM, Chiari-like malformation; SM, syringomyelia.

Table S3. Group means for CT-based measurements for CM normal versus abnormal..

¹Standard deviation, * based on 72 pairs of measurements, ** based on 53 pairs of measurementsAll measurements are in centimeters. Ratio 1: Interpupillary distance: intercanthal distance; Ratio 2: Circumference of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 1); Ratio 3: Maximum width of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 2); Ratio 4: Length of the dorsal aspect of the nose from the planum to the stop (muzzle length): Distance from the stop to the external occipital protuberance following the skull borders (CT-based craniofacial ratio); Ratio 5: Length of the dorsal aspect of the nose from the planum to the stop: Length of the mandible.

Table S4. Group means for CT-based measurements for SM normal versus abnormal..

¹Standard deviation, * based on 72 pairs of measurements, ** based on 53 pairs of measurementsAll measurements are in centimeters. Ratio 1: Interpupillary distance: intercanthal distance; Ratio 2: Circumference of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 1); Ratio 3: Maximum width of the skull at the level of the orbital fissure: Distance from the stop to the external occipital protuberance following the skull borders (modified cephalic index 2); Ratio 4: Length of the dorsal aspect of the nose from the planum to the stop (muzzle length): Distance from the stop to the external occipital protuberance following the skull borders (CT-based craniofacial ratio); Ratio 5: Length of the dorsal aspect of the nose from the planum to the stop: Length of the mandible.

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