Table 2.
Mean and SD of outcome variables in study arms.
| Characteristics | Placebo (n=792), mean (SD) | Content placebo (n=799), mean (SD) | Child voice (n=809), mean (SD) | Mother voice (n=806), mean (SD) | Physician voice (n=807), mean (SD) | P value | |
| Trait reactance proneness | 2.98 (0.48) | 2.97 (0.51) | 2.99 (0.52) | 2.97 (0.54) | 2.97 (0.52) | .92 | |
| Threat to freedom | 1.46 (0.55) | 1.83 (0.68) | 2.28 (0.86) | 2.34 (0.82) | 2.20 (0.80) | <.001 | |
| Psychological reactance | 1.56 (0.63) | 1.76 (0.69) | 1.99 (0.87) | 2.03 (0.83) | 1.95 (0.79) | <.001 | |
|
|
Anger | 1.51 (0.63) | 1.70 (0.72) | 1.95 (0.90) | 1.98 (0.87) | 1.90 (0.83) | <.001 |
|
|
Negative cognition | 1.64 (0.77) | 1.84 (0.79) | 2.05 (0.95) | 2.09 (0.91) | 2.02 (0.86) | <.001 |
| Attitude | 3.79 (0.60) | 4.28 (0.60) | 4.22 (0.64) | 4.14 (0.64) | 4.18 (0.65) | <.001 | |
| Source appraisal | 3.91 (0.52) | 3.67 (0.52) | 3.57 (0.58) | 3.63 (0.56) | 3.72 (0.54) | <.001 | |
|
|
Stupid or smart | 3.77 (0.78) | 3.50 (0.79) | 3.74 (0.81) | 3.59 (0.80) | 3.62 (0.75) | <.001 |
|
|
Unknowledgeable or knowledgeable | 4.06 (0.71) | 3.93 (0.75) | 3.82 (0.81) | 3.86 (0.74) | 3.88 (0.67) | <.001 |
|
|
Uninformed or informed | 4.17 (0.59) | 4.08 (0.66) | 4.03 (0.69) | 4.02 (0.68) | 4.03 (0.62) | <.001 |
|
|
Unintelligent or intelligent | 3.96 (0.63) | 3.69 (0.67) | 3.80 (0.67) | 3.72 (0.66) | 3.72 (0.65) | <.001 |
|
|
Unqualified or qualified | 3.75 (0.71) | 3.44 (0.68) | 3.06 (0.94) | 3.34 (0.74) | 3.56 (0.72) | <.001 |
|
|
Unreliable or reliable | 3.91 (0.67) | 3.69 (0.62) | 3.57 (0.75) | 3.64 (0.72) | 3.75 (0.66) | <.001 |
|
|
Inexpert or expert | 3.71 (0.71) | 3.40 (0.65) | 2.99 (0.86) | 3.23 (0.73) | 3.45 (0.69) | <.001 |