Appendix B
ANALYSIS OF RATINGS FROM NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION IN-DEPTH INTERVIEWS AND FOCUS GROUPS
Table B-1 Summary of Participants in NHTSA In-Depth Interviews and Focus Groups by Location and User Group
User Category |
Phoenix, Ariz. |
Portsmouth, N.H. |
St. Louis, Mo. |
Total |
|
In-depth (individual, in-person) |
|
|
|
|
|
interviews |
|
|
|
|
|
|
Part-time users |
25 |
30 |
34 |
89 |
|
Hard-core nonusers |
6 |
8 |
3 |
17 |
Focus groups of full-time users |
0 |
0 |
35 |
35 |
|
Total |
31 |
38 |
72 |
141 |
Table B-2 Analysis of Ratings from NHTSA In-Depth Interviews and Focus Groups by Technology, Overall and by User Group(Rating Scale: 1 = Least; 5 = Most) (Percentage of Respondents’ Ratings)
Table B-3 Analysis of Ratings from NHTSA In-Depth Interviews and Focus Groups by Gender, Age, and Location
Mean Acceptability |
Mean Effectiveness |
||||||||
|
Ford |
Saab |
Entertainment Interlock |
Transmission Interlock |
|
Ford |
Saab |
Entertainment Interlock |
Transmission Interlock |
Analysis by Gender |
|
|
|
|
|
|
|
|
|
Male (N = 57) |
3.82 |
3.33 |
2.89 |
2.54 |
Male (N = 57) |
3.88 |
3.98 |
3.74 |
4.42 |
Female (N = 84) |
4.08 |
3.63 |
2.89 |
3.26 |
Female (N = 84) |
4.38 |
4.49 |
3.64 |
4.74 |
Analysis by Age |
|
|
|
|
|
|
|
|
|
16-25 (N = 22) |
4.00 |
3.23 |
3.09 |
2.59 |
16-25 (N = 22) |
3.73 |
4.09 |
4.36 |
4.32 |
26-40 (N = 52) |
3.60 |
3.40 |
2.92 |
2.54 |
26-40 (N = 52) |
4.08 |
4.33 |
4.02 |
4.52 |
41-55 (N = 38) |
4.18 |
3.58 |
2.89 |
3.21 |
41-55 (N = 38) |
4.21 |
4.05 |
3.26 |
4.74 |
56 and over (N = 29) |
4.38 |
3.83 |
2.69 |
3.72 |
56 and over (N = 29) |
4.65 |
4.66 |
3.11 |
4.83 |
Analysis by Location |
|
|
|
|
|
|
|
|
|
St. Louis (N = 72) |
4.18 |
3.36 |
2.57 |
2.76 |
St. Louis (N = 72) |
4.46 |
4.29 |
3.61 |
4.72 |
Phoenix (N = 31) |
3.87 |
3.77 |
3.45 |
3.35 |
Phoenix (N = 31) |
4.05 |
4.35 |
4.06 |
4.42 |
Portsmouth (N = 38) |
3.68 |
3.58 |
3.05 |
3.05 |
Portsmouth (N = 38) |
3.74 |
4.21 |
3.50 |
4.55 |