Table 2.
Results of t-tests and effect sizes comparing expectation (pre-trial) and satisfaction (post-trial) of the patients in the EMMA group.
| Statement | Pre-trial M (SD) | Post-trial M (SD) | t | p | d (95%CI) |
|---|---|---|---|---|---|
| (1) Treatment logic | 8.39 (0.84) | 8.70 (1.15) | 1.19 | 0.245 | 0.24 (−0.18, 0.66) |
| (2) Treatment satisfaction | 8.17 (1.70) | 8.78 (1.20) | 2.13 | 0.045 | 0.43 (−0.01, 0.87) |
| (3) Recommending to others | 8.35 (1.43) | 9.13 (1.10) | 3.46 | 0.002 | 0.70 (0.23, 1.17) |
| (4) Usefulness for other disorders | 7.83 (1.82) | 8.70 (1.26) | 2.33 | 0.030 | 0.47 (0.03, 0.91) |
| (5) Usefulness for the patient | 8.04 (1.92) | 8.78 (1.31) | 2.49 | 0.021 | 0.50 (0.06, 0.94) |
| (6) Unpleasantness∗ | 5.91 (3.36) | 6.78 (2.88) | 1.17 | 0.255 | 0.24 (−0.18, 0.66) |
| Total score | 7.78 (1.37) | 8.48 (1.01) | 3.58 | 0.002 | 0.72 (0.25, 1.19) |
M = mean. SD = standard deviation. t = t-test comparing the means for expectations (pre-trial) and satisfaction (post-trial); positive t-values indicated a larger mean in the post-trial than in the pre-trial. p = probability level associated to the t-test. d = standardized mean change effect size. 95%CI: 95% confidence limits for d. ∗Item 6 is answered in reverse, and so it has been recoded to follow the same scoring criteria as the other five items on the scale.