In previous studies more questionnaires were used but these were often developed for osteoarthritis [ 12, 13, 26, 27].
Finally, 162 more questionnaires were sent to complete a lack of data in some age class, reaching a total of 1462 questionnaires sent in all 8 regions.
59 more questionnaires were excluded from analysis in order to ensure that the number of responses were proportionate to staff numbers at the various institutions.
Finally, two more questionnaires were added, as they were judged to be relevant: The Profile Fitness Mapping questionnaires (PFM) (Björklund, Hamberg, Heiden & Barnekow-Bergkvist, In preparation) The Standardised Nordic Questionnaires (SNQ) [ 27].
Because of parallel research, more questionnaires were sent out in one of the regions (WM): 1005 questionnaires equally distributed among the three types of patient contact with the GP cooperative.
In addition, up to six more questionnaires were to be distributed to other cadres such as lab technologists, pharmacists, nutritionists, radiologists, and physiotherapists if available making a maximum sample of 34 per hospital.
Subjects who completed more questionnaires were more likely to be currently working in a full-time or part-time role than those who completed fewer questionnaires (72% vs. 40%; p = 0.04), but were otherwise similar with respect to all other factors including baseline and final pain and disability (data not shown).
However, before the commencement of analysis one more questionnaire was excluded as it was not completed sufficiently.
Since the 1980's, more and more questionnaires have been developed to assess attachment in adults.
More extensive questionnaires are delivered at BL and at the 12-month follow-up, while all other questionnaires are shorter.
