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Patients' disappointment after finding out about receiving placebo treatment without adequate information in the past.
| Response | Yes, % | No, % | Do not know, % |
|---|---|---|---|
| Disappointment after impure placebo (herbal remedy or multivitamin preparation) | 44 | 46 | 10 |
| Disappointment after pure placebo (sugar tablet) | 54 | 35 | 11 |
P<0.001, χ2 21, degrees of freedom = 1, by McNemar's χ2 test for the ‘yes’ and ‘no’ answers; n = 338.
