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Table 1 List of attributes and levels

From: Identifying the primary outcome for a randomised controlled trial in rheumatoid arthritis: the role of a discrete choice experiment

Attributes Levels Variable name used in the model
Pain My feet are not painful when I walk
My feet are somewhat painful when I walk
My feet are extremely painful when I walk
pain_2
pain_1
Reference
Mobility
(e.g. walking, climbing stairs)
I have no problems with mobility
I have some problems with mobility
I have extreme problems with mobility
mobility_2
mobility_1
Reference
Doing everyday things / activities of daily living
(e.g. work, study, housework, family or leisure activities)
I have no problems with doing everyday activities
I have some problems with doing everyday activities
I have extreme problems with doing everyday activities
daily_activities_2
daily_activities_1 Reference
Fatigue I usually do not feel tired after walking
I usually feel moderately tired after walking
I usually feel extremely tired after walking
fatigue_2
fatigue_1
Reference
Shoes (choice of footwear) My walking ability is not affected by the footwear I choose.
My walking ability is moderately affected by the footwear I choose.
My walking ability is greatly affected by the footwear I choose
shoes_2
shoes_1
Reference
Health and fitness – exercise supervised by a physiotherapist or podiatrist To improve my walking, I will go for one-to-one supervised exercise, twice a week for 6 weeks (1)
To improve my walking, I will go for one-to-one supervised exercise, once a week for 12 weeks (2)
To improve my walking, I will go for supervised exercise as part of a group twice a week for 6 weeks. (3)
To improve my walking, I will go for supervised exercise as part of a group once a week for 12 weeks. (4)
health_fitness_3
health_fitness_2
health_fitness_1
Reference
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