Table 1.
Demographic and baseline driving data (Mean (SD)) by age and dose condition
| Younger | Older | |||||
|---|---|---|---|---|---|---|
| Placebo (n=12; 4♀) |
.04% (n=13; 5♀) |
.065% (n=11; 5♀) |
Placebo (n=12; 5♀) |
.04% (n=13; 5♀) |
.065% (n=11; 7♀) |
|
| Age* | 27.75 (2.1) | 28.69 (3.3) | 27.18 (2.0) | 62.25 (4.5) | 58.54 (2.8) | 60.55 (4.1) |
| Education* | 17.00 (0.7) | 17.00 (1.4) | 16.63 (1.3) | 16.33 (1.4) | 15.62 (2.0) | 16.18 (1.8) |
| GDS/BDI-IIa,b | 00.64 (1.8) | 02.00 (3.2) | 00.82 (1.5) | 01.67 (1.8) | 01.46 (1.8) | 02.55 (2.3) |
| STAIc* | 37.25 (5.4) | 36.92 (2.6) | 37.72 (4.0) | 41.33 (4.6) | 40.15 (5.9) | 44.36 (7.8) |
| QFId | 00.34 (0.2) | 00.44 (0.3) | 00.35 (0.2) | 00.44 (0.4) | 00.26 (0.2) | 00.21 (0.2) |
| Max-QFIe* | 03.75 (1.7) | 03.99 (1.4) | 03.55 (1.1) | 01.77 (1.0) | 02.55 (1.8) | 01.43 (0.8) |
| Soberf | 25.92 (24) | 19.23 (14) | 22.55 (10) | 11.17 (8.5) | 22.23 (16) | 21.82 (19) |
| BMIg* | 26.49 (3.9) | 25.39 (5.6) | 22.47 (3.6) | 26.54 (5.0) | 26.86 (4.7) | 27.84 (6.1) |
| Driving Distanceh* | 09.73 (8.3) | 12.18 (10) | 14.92 (16) | 23.42 (24) | 22.90 (19) | 17.25 (13) |
| SR (radians/sec)i* | 01.79 (1.1) | 01.99 (0.8) | 01.72 (0.4) | 02.72 (1.1) | 02.80 (1.0) | 02.39 (1.2) |
| LPSD (ft)j* | 00.90 (0.2) | 00.84 (0.1) | 00.87 (0.2) | 00.99 (0.4) | 01.07 (0.2) | 01.11 (0.3) |
| SD-Speed (MPH)k* | 09.00 (1.0) | 09.28 (1.2) | 09.09 (1.0) | 09.53 (1.1) | 09.60 (1.8) | 10.21 (1.1) |
| Avg Speed (MPH)l* | 51.76 (1.8) | 52.64 (3.9) | 51.75 (2.7) | 49.79 (3.2) | 49.76 (5.7) | 50.52 (3.5) |
*
Significant differences between older and younger participants (p<.05)
a
Geriatric Depression Scale (Yesavage et al, 1982);
b
Beck Depression Inventory-II (Beck et al, 1996);
c
Spielberger State Anxiety Inventory (Spielberger, 1983);
d
Quantity-frequency Index (average daily consumption of ethanol in ounces; 1 drink=~.6) (Cahalan et al, 1969);
e
Maximum QFI recorded during a single day in the past 6 months;
f
Number of the most consecutive non-drinking days in the past 6 months;
g
Body-Mass Index;
h
Average distance driven per week;
i
Steering rate (radians/sec);
j
Lane position standard deviation (ft.);
k
Standard deviation of speed (MPH);
l
Average speed (MPH)