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Table 1 Baseline description of the study subjects consisting of 50-yr olds from the general Danish population who participated in the baseline study (N = 412) and those participating in the present SMS-Track survey (N = 261)

From: Evidence-based classification of low back pain in the general population: one-year data collected with SMS Track

Variables of interest First survey 10 yrs prior to present study Present SMS-Track survey
N (%) N (%)
Proportion women 213 (52) 142 (54)
Employment status   
 Self employed 29 (7) 18 (7)
 Assisting spouse 2 (0) 0 (0)
 Employed 344 (84) 230 (88)
 Unemployed 17 (4) 7 (3)
 Pensioner 11 (3) 2 (1)
 Others outside labor force 9 (2) 4 (2)
Highest educational level   
 Basic school 92 (22) 49 (19)
 General upper-secondary education 9 (2) 6 (2)
 Vocational education/training 127 (31) 86 (33)
 Short-cycle higher education 84 (20) 56 (21)
 Medium-cycle higher education 77 (19) 50 (19)
 Long-cycle higher education 23 (6) 15 (5)
 Reported having had low back pain past year 284 (69) 170 (65)
Number of days with low back pain the year preceding study   
0 days 123 (30) 86 (33)
1–30 days 187 (45) 121 (46)
>30 days 102 (25) 54 (21)
Reported having been on sick-leave preceding year because of low back pain   
0 days 329 (80) 201 (77)
1–30 days 61 (15) 51 (20)
>30 days 22 (5) 9 (3)
  1. Information obtained from a Danish general population of 50-yr olds, who in the last survey were followed with fortnightly text-messages over one year.