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)
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) |