Table 1.

Characteristcs of subjects

case	sex	age	orthopaedic diagnosis	psychiatric comorbidity	duration (year)
1	F	70	lumbar spinal stenosis	none	5
2	F	75	lumbar spondylosis lumbar facet disorder	insomnia anxiety neurosis	4
3	M	70	lumbar disc hernia	bipolar affective disorder hypochondriasis	34
4	F	56	lumbar spinal stenosis	none	4
5	F	58	lumbar spinal stenosis	none	9
6	M	63	lunbar spondylosis	none	9
7	M	65	lumbar spinal stenosis lumbar disc hernia	none	3