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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.