Table 2. Adolescent P3 Amplitude as a Function of PSU Onset.
| Substanc e Group |
PSU Onset |
Electrode | n | Mean (SD) P3 Amplitude, uV |
Main effect for PSU group vs Controls |
LSD post hoc test for PSU Group Onset vs. Controls, p value |
Effect Size for PSU Onset vs. Controls |
|---|---|---|---|---|---|---|---|
| PSU- Nicotine |
Early | PZ | 122 | 30.21 (9.63) | F(2,1013) = 3.58, p = 0.03 |
0.01 | 0.19 |
| FZ | 123 | 5.96 (6.30) | |||||
| Late | PZ | 181 | 30.49 (9.35) | 0.10 | 0.16 | ||
| FZ | 181 | 6.26 (7.81) | |||||
| PSU- Alcohol |
Early | PZ | 51 | 29.06(9.56) | F(2,924) = 4.93, p = 0.01 |
0.02 | 0.30 |
| FZ | 52 | 5.24 (5.44) | |||||
| Late | PZ | 161 | 30.37 (8.63) | 0.02 | 0.21 | ||
| FZ | 164 | 5.69 (7.00) | |||||
| PSU- Illicit |
Early | PZ | 40 | 29.16 (9.54) | F(2,869) = 5.37, p < 0.01 |
0.02 | 0.32 |
| FZ | 41 | 4.91 (5.19) | |||||
| Late | PZ | 111 | 30.19 (9.12) | 0.01 | 0.23 | ||
| FZ | 114 | 5.48 (7.53) |
Note: The characteristics of the control group for PZ were: n=743, mean = 32.01; SD = 9.09. The characteristics of the control group for FZ were: n = 746; mean = 7.31; SD = 7.36.