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

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

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
Long-cycle higher education	5	6
Number of days with LBP past year
0 days	33	25
1-30 days	46	44
>30 days	21	32

Variables used for comparison were obtained through a questionnaire at baseline, when the study subjects were 40 years old.

ISSN: 2045-709X