Nasal width/length ratio is:

Nasal index is the ratio of nasal width to nasal height multiplied by 100.  The nose has been classified into three major groups based on the nasal parameters: Leptorrhine or fine nose (nasal index of 69.9 or less) Mesorrhine or medium (nasal index of 70.0 – 84.9) Platyrrhine or broad nose (nasal index of 85.0 or more)