Table 3. Driving Measures During the Study Session.
| Young | Older | ||||||
|---|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | ||||||
| Placebo | Low Dose | Moderate Dose | Placebo | Low Dose | Moderate Dose | ||
| Average Speed (ft/s) | Country | 60.23 (3.90) | 61.39 (5.90) | 62.45 (4.87) | 60.09 (3.46) | 58.73 (2.40) | 57.98 (4.01) |
| Metropolis a, c | 44.47 (3.00) | 44.19 (4.21) | 45.16 (3.98) | 40.46 (4.12) | 39.92 (3.24) | 38.11 (4.83) | |
| Percent Deceleration | Country Relevant a, c | 59.42 (14.30) | 56.06 (14.07) | 48.19 (12.82) | 64.82 (10.45) | 77.57 (7.81) | 70.16 (11.85) |
| Metropolis Relevant a, c | 64.17 (12.79) | 65.85 (10.26) | 53.30 (12.78) | 66.39 (6.22) | 69.03 (9.88) | 73.00 (12.00) | |
| Country Irrelevant a | 1.37 (1.91) | 2.06 (2.05) | 1.67 (1.99) | 2.70 (3.05) | 5.66 (5.47) | 2.28 (2.72) | |
| Metropolis Irrelevant a, b | 6.74 (6.28) | 7.61 (7.29) | 5.84 (4.22) | 11.12 (7.50) | 26.44 (16.56) | 24.06 (16.87) | |
| Range of Steering (max radians turned) | Country Relevant a, c | .156 (.057) | .171 (.139) | .200 (.113) | .461 (.156) | .350 (.168) | .291 (.098) |
| Metropolis Relevant | .165 (.115) | .192 (.132) | .273 (.309) | .302 (.232) | .188 (.102) | .249 (.146) | |
| Country Irrelevant a | .247 (.093) | .231 (.105) | .232 (.148) | .380 (.136) | .325 (.167) | .363 (.136) | |
| Metropolis Irrelevant a | .175 (.102) | .189 (.103) | .195 (.106) | .276 (.150) | .223 (.090) | .298 (.195) | |
| Distance Until Brake (ft) | Country Relevant | 255.5 (45.5) | 271.1 (62.3) | 265.4 (56.7) | 242.9 (92.9) | 288.0 (38.0) | 264.8 (63.5) |
| Metropolis Relevant | 327.6 (42.0) | 358.3 (16.9) | 347.6 (13.5) | 345.8 (43.4) | 345.4 (38.4) | 295.8 (111.1) | |
a
main effect of age, p<.05
b
main effect of dose, p<.05
c
age by dose interaction, p<.05