Table 1.
Summary of Mean Values
| Measure | Placebo | d-Amphetamine (8 mg) |
d-Amphetamine (16 mg) |
d-Amphetamine (24 mg) |
|---|---|---|---|---|
| Progressive-ratio | ||||
| Number of capsules earned | 1.1 | 3.3 | 4.5 | 2.6 |
| Addiction Research Center Inventory | ||||
| A | 1.9 | 2.5 | 2.9 | 3.7 |
| BG | 5.4 | 6.1 | 6.3 | 7.0 |
| PCAG | 3.5 | 2.8 | 2.5 | 2.5 |
| Adjective-Rating Scale | ||||
| Stimulant Scale | 4.8 | 7.5 | 9.9 | 10.9 |
| Drug-Effect Questionnaire | ||||
| Any Effect | 2.0 | 18.7 | 28.6 | 33.7 |
| Active-Alert-Energetic | 2.0 | 18.3 | 30.9 | 33.3 |
| Good Effects | 1.8 | 13.9 | 24.6 | 30.7 |
| Like Drug | 1.7 | 17.0 | 32.1 | 36.1 |
| Willing to Pay For | 1.7 | 11.4 | 24.9 | 26.5 |
| Stimulated | 1.8 | 14.1 | 22.0 | 26.2 |
| Talkative-Friendly | 1.9 | 7.2 | 26.9 | 25.6 |
| Rush | 1.7 | 7.2 | 9.5 | 17.5 |
| Bad Effects | 1.7 | 7.3 | 5.5 | 6.9 |
| Irregular-Racing Heartbeat | 1.7 | 3.6 | 8.0 | 8.8 |
| Restless | 1.7 | 10.0 | 12.2 | 13.1 |
| Shaky-Jittery | 1.5 | 4.3 | 7.8 | 11.4 |
| Digit-Symbol-Substitution-Task | ||||
| Number of Trials Correct | 64.4 | 65.2 | 68.0 | 67.9 |
| Cardiovascular Measures | ||||
| Systolic Pressure | 115.7 | 122.8 | 128.6 | 131.5 |
| Diastolic Pressure | 73.4 | 78.7 | 80.7 | 83.2 |
Mean values are not included for a particular measure if the repeated-measure ANOVA failed to reveal a significant effect of Dose. Bold and underlined values indicate significant difference (p ≤ .05) from placebo according to post-hoc tests. A = Amphetamine; BG = Benzedrine Group; PCAG = Pentobarbital, Chlorpromazine, Alcohol Group.