5. PROGRAM EVALUATION (continued)5.1.5 Driver Age and Gender
The next results address the demographics of the stopped drivers. These are presented simply to describe the stopped individuals rather than to suggest any overrepresentation since the underlying populations of all drivers on the road at the time of the stops is not known. Table 11 gives the gender of the Peoria drivers stopped for speeding as a function of their ages. Similar data for Phoenix are shown in Table 12. In terms of gender, Table 11 shows that the total Peoria sample of drivers stopped for speeding included more females (53.4%) than males (46.6%). In terms of age, the largest sample consisted of individuals who were in the range of 25 to 39 years (37.6%). This age range was followed by those who were 40 to 64 years old (33.7%), those who were under 25 (20.8%), and those who were 65 or older (7.9%). Males under 25 (27.7%) were stopped more often than females (14.8%) in the same age group, and females in the age range of 25 to 39 (42.3%) were stopped more often than males (32.3%) in that age group. For other age categories, the proportion of males and females was approximately the same.
Table 12 shows that the Phoenix sample of speeding drivers also included slightly more females (52.4%) than males (47.6%). In terms of age, the largest Phoenix sample consisted of individuals in the range of 40 to 64 (42.6%). It was followed by those who were 25 to 39 (33.8%), those who were under 25 (19%), and those who are 65 and older (4.6%). Males under 25 years of age (23.3%) were stopped more often than females (15.1%) in the same age group, and females in both age groups 25 to 39 and 40 to 64 were stopped more often than males in those age groups.
The mean age and age range of the stopped drivers from the two cities were similar. The mean age for Peoria drivers was 39 and the ages ranged from 16 to 82. The mean age for Phoenix drivers was 39.1 and the ages ranged from 15 to 85.