Which index is used to quantify head shape by comparing width to length?

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Multiple Choice

Which index is used to quantify head shape by comparing width to length?

Explanation:
The head shape is described by a ratio that compares width to length. This is captured by the cephalic index, which uses the width across the skull (biparietal diameter) divided by the length from the occipital to the frontal bone (occipitofrontal diameter) and multiplied by 100 to give a percentage. This index shows whether the head is broad and short (brachycephalic) or long and narrow (dolichocephalic). The other measurements describe size or a single dimension: width alone, length alone, or overall circumference, none of which express the shape as a width-to-length ratio.

The head shape is described by a ratio that compares width to length. This is captured by the cephalic index, which uses the width across the skull (biparietal diameter) divided by the length from the occipital to the frontal bone (occipitofrontal diameter) and multiplied by 100 to give a percentage. This index shows whether the head is broad and short (brachycephalic) or long and narrow (dolichocephalic). The other measurements describe size or a single dimension: width alone, length alone, or overall circumference, none of which express the shape as a width-to-length ratio.

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