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Table 1 Description of responders and non-responders in a study sample aged 50 years from the general Danish population (N = 261)

From: Absence of low back pain in the general population followed fortnightly over one year with automated text messages

Information obtained at base-line Responders (n = 261) % Non responders (n = 16) and persons excluded from the analyses (n = 16) %
Gender
Male 46 53
Female 54 47
Employment status
Self employed 7 7
Assisting spouse 0 1
Employed 88 76
Unemployed 3 7
Pensioners 1 6
Others outside labour force 2 3
Highest educational level
Basic school 19 28
General upper-secondary education 2 2
Vocational education and training   
Short-cycle higher education 33 27
Medium-cycle higher education 21 19
Long-cycle higher education 19 18
5 6
Number of days with LBP past year
0 days 33 25
1-30 days 46 44
>30 days 21 32
  1. Variables used for comparison were obtained through a questionnaire at baseline, when the study subjects were 40 years old.