Table 1.
Descriptive Statistics and Correlations of Variables in the Present Study
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
|---|---|---|---|---|---|---|---|---|---|
| 1. ACE - T1b | -- | ||||||||
| 2. Poor sleep quality b | .15** | -- | |||||||
| 3. Sleep inadequacy b | .11* | .35** | -- | ||||||
| 4. Difficulty falling asleep b | .15** | .39** | .29** | -- | |||||
| 5. DRD - T1b | −.04 | .00 | −.05 | .02 | -- | ||||
| 6. DRD - T2b | .04 | −.02 | .11* | .00 | .20** | -- | |||
| 7. Smoking - T1a | .15** | −.01 | .10* | .10* | .00 | .02 | -- | ||
| 8. Smoking - T2a | .17** | .06 | .05 | .13** | −.03 | −.02 | .67** | -- | |
| 9. Smoking- T3a | .14* | −.02 | −.02 | .10* | .03 | .10 | .57** | .63** | -- |
|
| |||||||||
| Mean | 2.82 | .00 | .00 | .00 | −1.66 | −1.59 | .99 | .93 | .94 |
| Median | 2.00 | −.44 | −.19 | −.47 | −1.60 | −1.47 | .00 | .00 | .00 |
| Standard Deviation | 2.97 | 2.55 | 2.20 | 2.26 | .72 | .70 | 1.38 | 1.40 | 1.40 |
| Range | .00 to 16.00 | −3.66 to 12.75 | −7.53 to 5.35 | −3.11 to 9.07 | −3.80 to −.61 | −3.80 to −.61 | .00 to 6.00 | .00 to 7.00 | .00 to 7.00 |
Note.
a
For smoking at T2 and T3, Spearman’s nonparametric correlations were presented;
b
for other variables, Pearson’s correlation were presented. T1 = Time 1. T2 = Time 2. T3 = Time 3. ACE = Adverse Childhood Experiences. DRD = Delayed reward discounting. SLP = Sleep. Poor sleep quality, sleep inadequacy and difficulty falling asleep were calculated by summing the standardized scores of their observed indicators, respectively.
*
p < .05,
**
p < .01.