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Table 1 Attributes and levels included in the DCE

From: Patients accept therapy using embryonic stem cells for Parkinson’s disease: a discrete choice experiment

Attribute

Formulation

Levels

Description of levels

Type of treatment

The treatment consists of…

hESCsa

Cells taken from donated fertilized eggs. The cells have been multiplied and directed to produce dopamine.

  

iPS cellsb

Your own/donated cells (e.g. blood cells) that have been multiplied and directed to produce dopamine.

  

Electric stimulation

An implanted electrode with thin wire and stimulator that stimulates the brain.

  

Drug

Drugs for Parkinson’s disease.

Aim of treatment

The aim of the treatment is to…

Relieve symptoms

Improve function and well-being without affecting the development of the disease. As the disease progresses, doses usually need to be increased to obtain sufficient relief.

  

Slow down disease progression

Affects the development of the disease so that the disease develops more slowly than it would have if you had not been treated.

  

Repair damage caused by disease

Affects disease progression and restores functions lost due to your Parkinson’s disease.

Available knowledge and experience of treatment

Number of patients that have received the treatment is…

50

After clinical research studies, the treatment has been approved for treatment against Parkinson’s disease. A total of 50 people have received the treatment.

  

500

After clinical research studies, the treatment has been approved for treatment against Parkinson’s disease. A total of 500 people have received the treatment.

  

5000

After clinical research studies, the treatment has been approved for treatment against Parkinson’s disease. A total of 5000 people have received the treatment.

Effect on symptoms

Treatment effect on symptoms (for example, balance difficulties, tremors, depression, and dementia). The proportion that achieves sufficient function and well-being to at the moment

not needing additional/different treatment for Parkinson’s is…

2 out of 10 will get enough effectiveness

Out of 10 who receive the treatment, 2 people achieve sufficient function and well-being to not currently need additional/different treatment for Parkinson’s.

  

5 out of 10 will get enough effectiveness

Out of 10 who receive the treatment, 5 people achieve sufficient function and well-being to not currently need additional/different treatment for Parkinson’s.

  

8 out of 10 will get enough effectiveness

Out of 10 who receive the treatment, 8 people achieve sufficient function and well-being to not currently need additional/different treatment for Parkinson’s.

Risk for severe side effects

The risk that the treatment causes a serious side effect that has a negative lasting effect on function and well-being is…

20 out of 1000

Out of 50 people who start the treatment, 1 person suffers some kind of serious side effect.

  

10 out of 1000

Out of 100 people who start the treatment, 1 person suffers some form of serious side effect.

  

1 out of 1000

Out of a thousand people who start the treatment, 1 person suffers some kind of serious side effect.

  1. a Human embryonic stem cells
  2. b Induced pluripotent stem cells