Table 4:
Distribution of Self-Reported Driving Behaviors by Intervention Group and Time
| Intervention group | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total Population | LCO-D | LCO-ND | HE-D | HE-ND | ||||||||||||
| N | Mean (SD) | Median (IQR) | N | Mean (SD) | Median (IQR) | N | Mean (SD) | Median (IQR) | N | Mean (SD) | Median (IQR) | N | Mean (SD) | Median (IQR) | ||
|
Hand held cell phone use (average days per month) | ||||||||||||||||
| Baseline | 60 | 0.78 (1.70) | 0 (0, 1) | 15 | 0.67 (1.40) | 0 (0, 1) | 16 | 0.5 (0.73) | 0 (0, 1) | 15 | 1.27 (2.81) | 0 (0, 1) | 14 | 0.68 (1.23) | 0 (0, 1.5) | |
| 1-month | 58 | 2.22 (4.3) | 0 (0, 2) | 14 | 2.79 (5.59) | 0 (0, 2) | 16 | 2.56 (4.40) | 0 (0, 3.5) | 15 | 1.6 (3.07) | 0 (0, 3) | 13 | 1.92 (4.23) | 0 (0, 2) | |
| 3-month | 55 | 2.44 (5.13) | 0 (0, 2) | 14 | 1.86 (4.05) | 0 (0, 2) | 15 | 3.6 (6.62) | 0 (0, 5) | 13 | 3.08 (6.51) | 0 (0, 1) | 13 | 1.08 (1.61) | 0 (0, 1) | |
| 6-month | 56 | 3.07 (5.48) | 1 (0, 4.50) | 13 | 3.31 (7.10) | 0 (0, 3) | 15 | 3.87 (6.58) | 1 (0, 5) | 15 | 3.4 (4.52) | 1 (0, 5) | 13 | 1.54 (3.04) | 0 (0, 1) | |
|
Hands free cell phone use (average days per month) | ||||||||||||||||
| Baseline | 60 | 1.08 (2.17) | 0 (0, 1.5) | 15 | 0.87 (2.59) | 0 (0, 0) | 16 | 0.88 (1.36) | 0 (0, 1.5) | 15 | 0.97 (1.88) | 0 (0, 2) | 14 | 1.68 (2.77) | 0.5 (0, 2) | |
| 1-month | 58 | 2.16 (4.51) | 0 (0, 2) | 14 | 1.71 (2.89) | 0 (0, 5) | 16 | 1.69 (3.16) | 0 (0, 2) | 15 | 2.40 (4.91) | 0 (0, 2) | 13 | 2.92 (6.76) | 0 (0, 0) | |
| 3-month | 55 | 2.65 (4.84) | 0 (0, 3) | 14 | 2.79 (5.49) | 0 (0, 1) | 15 | 4.47 (5.72) | 3 (0, 10) | 13 | 1.15 (2.19) | 0 (0, 0) | 13 | 1.92 (4.73) | 0 (0, 0) | |
| 6-month | 55 | 3.16 (5.03) | 1 (0, 4) | 13 | 3.00 (4.40) | 0 (0, 6) | 15 | 5.07 (6.94) | 2 (0, 9) | 14 | 2.21 (3.53) | 0.5 (0, 3) | 13 | 2.15 (4.24) | 0 (0, 3) | |
|
Read text (average days per month) | ||||||||||||||||
| Baseline | 60 | 1.86 (4.61) | 0 (0, 2) | 15 | 2.53 (7.10) | 0 (0, 2) | 16 | 1.06 (1.69) | 0 (0, 1.5) | 15 | 2.2 (4.49) | 0 (0, 2) | 14 | 1.68 (3.94) | 0 (0, 1) | |
| 1-month | 58 | 2.88 (5.53) | 0 (0, 2) | 14 | 4.21 (7.62) | 0.5 (0, 2) | 16 | 2.63 (5.19) | 1 (0, 2.5) | 15 | 2.53 (4.47) | 0 (0, 3) | 13 | 2.15 (4.72) | 0 (0, 1) | |
| 3-month | 55 | 4.22 (7.00) | 1 (0, 4) | 14 | 3 (6.85) | 0.5 (0, 2) | 15 | 4.6 (6.67) | 2 (0, 6) | 13 | 5.54 (8.53) | 2 (1, 4) | 13 | 3.77 (6.41) | 1 (0, 3) | |
| 6-month | 56 | 4.48 (6.26) | 2 (0, 5.50) | 13 | 4.38 (7.53) | 1 (0, 4) | 15 | 5.93 (7.27) | 3 (1, 10) | 15 | 4.93 (6.12) | 3 (0, 10) | 13 | 2.38 (3.12) | 1 (0, 4) | |
| Send text (average days per month) | ||||||||||||||||
| Baseline | 60 | 1.61 (4.43) | 0 (0, 1) | 15 | 2.27 (7.16) | 0 (0, 1) | 16 | 0.63 (1.63) | 0 (0, 0) | 15 | 2.07 (3.58) | 0 (0, 4) | 14 | 1.54 (3.9) | 0 (0, 1) | |
| 1-month | 58 | 1.76 (4.49) | 0 (0, 1) | 14 | 3.14 (7.28) | 0 (0, 1) | 16 | 1.38 (2.70) | 0 (0, 1.5) | 15 | 1.27 (3.86) | 0 (0, 0) | 13 | 1.31 (2.95) | 0 (0, 1) | |
| 3-month | 55 | 2.82 (6.25) | 0 (0, 2) | 14 | 1.86 (5.39) | 0 (0, 0) | 15 | 3.8 (6.86) | 0 (0, 5) | 13 | 3 (8.18) | 0 (0, 2) | 13 | 2.54 (4.5) | 0 (0, 2) | |
| 6-month | 56 | 2.82 (5.22) | 0 (0, 3.50) | 13 | 1.62 (4.25) | 0 (0, 0) | 15 | 4.87 (7.41) | 1 (0, 10) | 15 | 2.47 (4.6) | 0 (0, 3) | 13 | 2.08 (3.23) | 0 (0, 4) | |
| Highest number of teen passengers | ||||||||||||||||
| Baseline | 60 | 1.97 (1.44) | 2 (1, 2.5) | 15 | 1.4 (0.99) | 1 (1, 2) | 16 | 2.25 (1.34) | 2 (1, 2.5) | 15 | 2.2 (1.82) | 1 (1, 3) | 14 | 2.00 (1.47) | 1.50 (1, 3) | |
| 1-month | 58 | 1.97 (1.14) | 2 (1, 2) | 14 | 1.5 (0.94) | 1.5 (1, 2) | 16 | 2.13 (1.15) | 2 (1, 2.5) | 15 | 2.2 (1.26) | 2 (1, 2) | 13 | 2.00 (1.15) | 2 (1, 3) | |
| 3-month | 55 | 2.56 (1.41) | 2 (1, 3) | 14 | 2.71 (1.64) | 2.5 (1, 3) | 15 | 2.40 (0.91) | 2 (2, 3) | 13 | 2.62 (1.71) | 2 (1, 3) | 13 | 2.54 (1.45) | 2 (1, 4) | |
| 6-month | 56 | 3.09 (1.35) | 3 (2, 4) | 13 | 2.54 (1.13) | 3 (2, 3) | 15 | 3.20 (1.01) | 3 (2, 4) | 15 | 3.6 (1.35) | 4 (2, 4) | 13 | 2.92 (1.75) | 3 (2, 4) | |