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Table 1 Description of the study cohort.

From: Primary care consultation, hospital admission, sick leave and disability pension owing to neck and low back pain: a 12-year prospective cohort study in a rural population

  n %
Total sample 2,351 100.0
Participation survey 1 (1990–91) 1,782 75.8
Non-participation survey 1 569 24.2
   deceased 6 0.2
   ill 36 1.5
   unable to attend 48 2,0
   unwilling to attend 157 6.7
   did not attend, unknown reason 304 12.9
   not retrievable 11 0.5
   moved 7 0.3
Participation survey 2 1,589 67.6
Non-participation survey 2 762 32.4
   deceased 143 6.1
   ill 49 2.08
   unable attend 82 3.49
   unwilling to attend 192 8.17
   did not attend, unknown reason 294 12.5
   not retrievable 2 0.1
Participation in both surveys 1,405 59.81
Specific back diagnosis survey 1 58 2.5
Study cohort for analyses 1,347 57.3
  1. 1 63.6% of those still alive.