Table 2.

Detailed explanation of users’ needs for walkers.

Requirements attributes	Explanation details
Basic Type M	The basic requirements provided by the basic M-walker must be met, and if they are not met, the degree of satisfaction will decrease
Charming Type A	Meets this need in the design of walker, the satisfaction will be improved, and vice versa
Undifferentiated Type I	The influence is not considered in the design of the walker
Reverse Type R	In the design of the walker, if it is insufficient, it will be reduced
The expected value O	Meets the hidden needs of users. If it is not met, it will not affect, but if it is met, it will be greatly improved