Table 2.
Repeated measures analysis of subjective and behavioral measures of the nocebo effect.
| Effect | Outcome measure F (df num; df den); pa |
|---|---|
| Subjective rating (VAS) | |
| Main effectsb | |
| Cue (high, low) | 5.37(1; 40); 0.026 |
| Trial [1–5] | 4.64 (4; 86); 0.002 |
| Interaction effect | |
| Cue × Trial | 1.04 (4; 95); 0.393 |
| Behavioral discrimination | |
| Main effectsc | |
| Cue (high, low) | 1.42 (1; 36); 0.242 |
| Trial [1–5] | 1.20 (4; 104); 0.316 |
| Interaction effect | |
| Cue × Trial | 0.07 (4; 89); 0.991 |
| Behavioral discrimination, with non-/responder subgroups | |
| Main effectsd | |
| Cue (high, low) | 0.65 (1; 188); 0.421 |
| Subgroup (non-/responders) | 1.35 (1; 21); 0.258 |
| Interaction effect | |
| Cue × Subgroup | 4.38 (1; 188); 0.038 |
Results of analyses with linear mixed models for an ANOVA design with repeated measures bfor the subjective rating (VAS, visual analog scale), cfor behavioral discrimination, and ddividing the sample into subgroups of responders and non-responders, during the test phase. aAdjusted F-ratios, degrees of freedom for denominators (den) and for numerators (num) in brackets and exact probabilities for main effects and interactions.