Stefan Elbers

38 Chapter 2 Table 1. Patient Characteristics. Author (year) cohort N Dropout (%) Lost to follow- up (%) Nationality % Females Mean age ( SD ) Patient group Mean pain duration (months) Abbasi (2012): a 36 10 0 Iran 88 45 (10) low back pain 107.5 Abbasi (2012): b 36 0 16.67 Iran 88 45 (10) low back pain 107.5 Beaudreuil (2010) 39 0 0 France 28 42.9 (8.2) low back pain 28.6 Bendix (1998)a 238 14.55 6.38 Denmark 67.4 42 (NA) chronic low back pain NA Bendix (1998): b 238 10.87 9.76 Denmark 70.27 41 (NA) chronic low back pain NA Bendix (2000) 138 13.56 5.88 Denmark 66.1 42.1 (NA) chronic low back pain NA Bergström (2001) 156 NA NA Sweden 48 42.5 (9.5) neck pain or back pain 38 Bergström (2014) 43 9.3 12.82 Sweden 80 41 (NA) disabling chronic pain NA Bileviciute- Ljungar (2014): a 88 NA NA Sweden 84 43.2 (2.1) persistent musculoskeletal pain NA Bileviciute- Ljungar (2014): b 88 NA NA Sweden 89.47 39.5 (1.9) persistent musculoskeletal pain NA Borys (2015) 155 0 59.35 Germany 55.6 58.3 (10.4) chronic low back pain 217.2 Brendbekken (2016) 284 2.84 37.96 Norway 53.9 41.3 (NA) musculoskeletal pain NA Cardosa (2012) 102 0 0 Malaysia 64.3 42.87 (9.87) chronic pain 66.81 De Rooij (2014) 138 9.77 5 Netherlands 95 45.04 (10.3) chronic widespread pain 84 Dysvik (2013) 117 11.11 8.65 Norway 79 45 (11.25) chronic non- malignant pain 89.9 Frost (2000) 129 1.63 19.83 United Kingdom 45 43 (9) constant pain NA Gantschnig (2017) 30 13.33 -3.85 Swiss 43 44.83 (12.57) ICD-10 diagnosis of chronic musculoskeletal pain NA