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Table 3 Baseline characteristics for all patients seen at the Spine Centre during seven years by information given in central registersa

From: The clinical back pain courses described by information available in Danish central registries

   Total
N = 60,913
2011–2013
N = 23,763
2014–2015
N = 18,084
2016–2017
N = 19,066
Model I: Age     
At least six months between courses Median (25%; 75%) 53 (42; 66) 51 (40; 64) 53 (42; 66) 54 (43; 67)
Sex     
Male 28,599 (44.2%) 11,057 (43.9%) 8538 (44.1%) 9004 (44.6%)
Female 36,158 (55.8%) 14,139 (56.1%) 10,817 (55.9%) 11.202 (55.4%)
CCI     
0 46,615 (72%) 18.350 (73%) 13,864 (72%) 14,401 (71%)
1 9587 (15%) 3665 (15%) 2913 (15%) 3009 (15%)
> 1 8555 (13%) 3181 (13%) 2578 (13%) 2796 (14%)
Prior chiropractor or physiotherapist treatment     
Yes 25.711 (40%) 9567 (38%) 7764 (40%) 8380 (41%)
No 39,046 (60%) 15,629 (62%) 11,591 (60%) 11,826 (59%)
Model II: Age     
At least one year between courses Median (25%; 75%) 52 (41; 65) 51 (40; 64) 53 (42; 66) 54 (43; 67)
Sex     
Male 27,016 (44.3%) 10,470 (44.1%) 8028 (44.4%) 8518 (44.7%)
Female 33,897 (55.7%) 13,293 (55.9%) 10,056 (55.6%) 10.548 (55.3%)
CCI     
0 44,090 (72.4%) 17,410 (73.3%) 13,027 (72.0%) 13,653 (71.6%)
1 8921 (14.7%) 3416 (14.4%) 2700 (14.9%) 2805 (14.7%)
> 1 7902 (13.0%) 2937 (12.4%) 2357 (13.1%) 2608 (13.7%)
Prior chiropractor or physiotherapist treatment     
Yes 24,769 (40.7%) 9250 (38.9%) 7432 (41.1%) 8087 (42.4%)
No 36,144 (59.3%) 14,513 (61.1%) 10,652 (58.9%) 10,979 (57.6%)
Model III: Age     
At least two years between courses Median (25%; 75%) 52 (41; 65) 51 (40; 64) 53 (41; 66) 54 (43; 67)
Sex     
Male 25,481 (44%) 10,019 (44%) 7493 (45%) 7969 (45%)
Female 31,856 (56%) 12,771 (56%) 9316 (55%) 9769 (55%)
CCI     
0 42,024 (73%) 16,906 (74%) 12,267 (73%) 12,851 (72%)
1 8194 (14%) 3202 (14%) 2546 (14%) 2546 (14%)
> 1 7119 (12%) 2682 (12%) 2341 (13%) 2341 (13%)
Prior chiropractor or physiotherapist treatment     
Yes 23,709 (41%) 8986 (39%) 7063 (42%) 7660 (43%)
No 33.628 (59%) 13,804 (61%) 9746 (58%) 10,078 (57%)
  1. aEach patient is defined by the course of the patient