Table 1:
Symptom questionnaires scores and episodic memory task performance accuracy.
| Mindfulness Group | Waiting List Control | ANOVA (time X group interaction) | |||||
|---|---|---|---|---|---|---|---|
| mean (SD) | Paired t-test | mean (SD) | paired t-test | ||||
| Pre | Post | Pre | Post | ||||
| PSS | 22.421 (8.375) | 16.895 (8.055) | t=3.529 p=0.002 | 19.176 (6.013) | 20.176 (7.860) | t=−0.696 p= 0.497 | F(1,34) = 9.276, p = 0.004, η2=0.214 |
| STAI-t | 45.850 (13.019) | 41.000 (12.998) | t=2.945 p=0.008 | 44.333 (11.902) | 45.667 (13.069) | t=−0.814 p=0.429 | F (1,33) = 6.785, p = 0.014, η2=0.171 |
| BDI | 18.211 (11.835) | 17.000 (15.790) | t=0.389 p=0.702 | 16.688 (2.981) | 16.188 (3.304) | t=0.249 p=0.807 | F(1,33) = 0.034, p = 0.855, η2=0.001 |
| Performance Accuracy | 0.858 (0.053) | 0.874 (0.034) | t=−1.5971 p=0.126 | 0.850 (0.072) | 0.887 (0.041) | t=−3.241 p=0.004 | F(1,40) =1.341, p = 0.254, η2= 0.032 |
1
The post-intervention change of episodic memory task performance accuracy of the mindfulness group did not reach significance because 6 subjects who completed the intervention after their waiting period completed the task for the third time, thus there could be ceiling effect with their performance improvement; after removing the 6 subjects, the mindfulness group did have significant increase in performance accuracy (average (SE) pre-intervention accuracy =0.841(0.059), post-intervention accuracy = 0.874 (0.037), t(14)=2.734, p = 0.016, d = 1.038).