Table 2.
Stress reports in each trial and change scores
| Group
|
Nocebo group
|
Natural History group
|
||||||
|---|---|---|---|---|---|---|---|---|
| (N=57, 40 females)
|
(N=54, 33 females)
|
|||||||
| Trial | Mean/median | SD | Min–Max | Mean/median | SD | Min–Max | U | P |
| Pretest | 3.65/3 | 2.13 | 0 to 9 | 3.70/4 | 2.01 | 0 to 8 | 1,505 | 0.89 |
| Posttest 1 | 2.56/2 | 1.35 | 1 to 9 | 1.82/1 | 1.86 | 0 to 7 | 2,128.5 | <0.001 |
| Posttest 2 | 2.39/2 | 1.25 | 0 to 7 | 1.79/2 | 1.57 | 0 to 6 | 1,937 | 0.016 |
| ΔPretest − Posttest 2 | 1.08/1 | 2.13 | −5 to 6 | 1.65/2 | 1.98 | −2 to 8 | 1,207.5 | 0.045 |
Notes: P-values denote the difference between the groups as shown by the Mann–Whitney test. Δ = change score (Pretest − Posttest 2). N=111.
Abbreviations: SD, standard deviation; Min, minimum; Max, maximum; U, Mann–Whitney U-test.