A total of 1,935 marks were found in the sample of 100 Q5 photographs, resulting
in an average number of marks per photograph of 19. On average, 5.4 different
mark types were found per photograph and all photographs contained at least
one mark. Thirty-three percent of the sample photographs were 3MP-identifiable.
The prevalence in the population of six mark types, including the saddle patch
and the notch, exceeded 33% (Table 2).