As someone who generally doesn’t react well to Big Pharma products, this is interesting. They include homeopathic remedies on the list which probably increases the number but even so, the numbers are high. The Guardian:

Recent research, he said, showed that placebos had helped 59% of patients who had been suffering from an upset stomach. Used to treat depression, placebos have the same effect as antidepressants in about a third of cases.

The efficacy of a placebo depends on many factors, according to the report, including the size and colour of a pill.

The more expensive the placebo, the higher the success rate, the study found, and intravenous injections are shown to be more effective than oral medication.

It’s also a question of trust. Placebos produce better results if a patient feels their doctor understands their concerns, and believes they are being taken seriously, the study says.