<qa>  How many subjects were randomly divided into two groups?Methods: A total of 64 subjects with CLBP and older were randomly divided into two groups: an experimental group UC counseling of AF and control group UC. Each group consisted of 32 participants and were evaluated twice pre and post-intervention, being spaced one month, both groups received telephone follow-up for their participation. The primary endpoint was the magnitude of the CP measured by the tool grading scale of chronic pain EGDC, while as secondary were considered the cardiovascular risk factors, catastrophism, kinesiofobia, disabled by back pain, quality of life, anxiety and depression and the FA. 