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Table 1 Basic description of clinical courses by models

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

   Total 2011–2013 2014–2015 2016–2017
Model I: Number 64,757 25,196 19,355 20,206
At least six months between courses Number of patients started # course during study period     
first 55,441 (85.6%) 23,638 (93.8%) 16,077 (83.1%) 15,726 (77.8%)
second 7842 (12.1%) 1492 (5.9%) 2780 (14.4%) 3570 (17.7%)
third or more 1474 (2.3%) 66 (0.3%) 498 (2.5%) 910 (4.5%)
Days of clinical course     
Median (25%;75%) 48 (8;113) 60 (15; 132) 43 (1; 107) 39 (1; 95)
Days between clinical course     
Median (25%;75%) 525 (308; 926) 324 (253; 489) 482 (301; 790) 728 (386; 1232)
Model II: Number 60,914 23,763 18,085 19,066
At least one year between courses Number of patients started # course during study period     
first 55,031 (82.5%) 23,194 (97.6%) 16,101 (89.0%) 15,736 (82.5%)
second 5433 (8.9%) 568 (2.3%) 1900 (10.5%) 2965 (15.6%)
third or more 442 (0.7%)   84 (0.5%) 357 (1.9%)
Days of clinical course     
Median (25%;75%) 55 (13;143) 70 (22; 164) 49 (8; 134) 43 (3; 121)
Days between clinical course     
Median (25%;75%) 760 (526; 1139) 525 (434; 645) 681 (493; 953) 931 (602; 1381)
Model III: Number 60,173 22,790 16,810 17,728
At least two years between courses Number of patients
started # course during study period
    
first 57,338 (95.1%) 22,718 (99.7%) 16,027 (95.3%) 15,758 (88.8%)
second or more 2835 (4.9%) 72 (0.3%) 783 (4.7%) 1970 (11.2%)
Days of clinical course     
Median (25%;75%) 64 (18;211) 83 (28; 258) 58 (14; 203) 49 (8; 163)
Days between clinical course     
Median (25%;75%) 1108 (897; 1440) 812 (764; 895) 1009 (855; 1177) 1212 (958; 1548)