Table 3.
Principal components analysis (PCA) of subjective-effect measures.
| AMPH dose conditions |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| 5 mg |
10 mg |
20 mg |
|||||||
| Factor1 Euphoria |
Factor2 Arousal |
Factor3 Dysphoria |
Factor1 Euphoria |
Factor2 Arousal |
Factor3 Dysphoria |
Factor1 Euphoria |
Factor2 Arousal |
Factor3 Dysphoria |
|
| DEQ | |||||||||
| Feel | .896 | −.100 | .028 | .890 | −.201 | .046 | .917 | −.128 | .374 |
| Like | .888 | −.041 | −.057 | .913 | −.074 | −.115 | .922 | −.104 | .065 |
| High | .873 | −.056 | .074 | .875 | −.161 | .122 | .902 | −.131 | .302 |
| More | .697 | .039 | −.002 | .769 | −.006 | −.122 | .775 | −.180 | −.088 |
| ARCI | |||||||||
| A | *** | *** | *** | .624 | .321 | .091 | .700 | .208 | .039 |
| MBG | .541 | .446 | −.061 | .671 | .337 | −.052 | .724 | .120 | −.157 |
| Benzedrine | .079 | .746 | −.095 | .266 | .741 | .041 | .263 | .706 | .063 |
| LSD | .177 | −.072 | .643 | .042 | −.118 | .720 | .391 | −.056 | .704 |
| PCAG | .130 | −.841 | −.115 | .230 | −.887 | −.096 | .223 | −.984 | −.153 |
| POMS | |||||||||
| Vigor | .185 | .781 | .001 | .221 | .698 | .030 | .333 | .682 | .049 |
| Arousal | .000 | .988 | .149 | .006 | .956 | .121 | .060 | 1.008 | .224 |
| Elation | *** | *** | *** | *** | *** | *** | .544 | .160 | −.473 |
| Friendliness | *** | *** | *** | *** | *** | *** | .414 | .022 | −.581 |
| Positive Mood | *** | *** | *** | *** | *** | *** | .470 | .209 | −.514 |
| Anxiety | −.032 | .199 | .913 | −.097 | .144 | .875 | .097 | .331 | .957 |
| Fatigue | .167 | −.802 | −.025 | .171 | −.808 | .080 | .211 | −.860 | −.023 |
| Confusion | .071 | −.613 | .389 | .066 | −.652 | .358 | .236 | −.619 | .342 |
| Depression | −.101 | −.062 | .672 | *** | *** | *** | *** | *** | *** |
***
Subjective-effect scales that were not significantly altered by the AMPH dose were not included in the PCA. Bold items indicate the outcome measures that were used to calculate factor scores used in subsequent analyses.