On how many days did you have this back pain during the last month? Number of days
Literal question
During the last 12 months/year, have you experienced, stiffness in the joint in the morning after getting up from bed, or after a long rest of the joint without movement?
Categories
Value
Category
1
yes
2
no
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.