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Table 2 Clinical and demographic Characteristics of derivation cohort and validation cohort

From: The Amsterdam wrist rules: the multicenter prospective derivation and external validation of a clinical decision rule for the use of radiography in acute wrist trauma

Characteristics Derivation cohorta (n = 487) Validation cohortb (n = 395) Totalc (n = 882)
Age, median (IQR) 48 (29–61) 52 (33–68) 50 (31–63)
Female, No. (%) 276 (57) 256 (64.8) 532 (60.3)
Mechanism of injury, No. (%)    
 FOOSH 320 (65.7) 265 (67.1) 585 (66.3)
 Direct blow or compression 42 (8.6) 22 (5.5) 64 (7.3)
 Traffic accident 37 (7.6) 33 (8.4) 70 (8.0)
 Forced hyperflexion 19 (3.9) 6 (1.5) 25 (2.8)
 Punch 13 (2.7) 4 (1.0) 17 (1.9)
 Other/unknown 56 (11.5) 65 (16.5) 121 (13.7)
Patients with a wrist fractured, No. (%) 251 (51.5) 219 (55.4) 470 (53.3)
 Distal radius fracture, No. (%)e 200 (41.1) 184 (46.6) 384 (43.5)
 Triquetrum fracture, No. (%)e 26 (5.3) 11 (2.8) 37 (4.2)
 Scaphoid fracture, No. (%)e 25 (5.1) 23 (5.8) 48 (5.4)
 Isolated distal ulna fracture, No. (%)e 7 (1.4) 3 (0.8) 10 (1.1)
 Other carpal bone fracture, No. (%)e 2 (0.4) 1 (0.3) 3 (0.3)
Patients with multiple wrist fractures, No. (%) 7 (1.4) 4 (1) 11 (1.2)
Treatmentf    
 Expectant 38 (7.8) 28 (7.0) 66 (7.5)
 Compression bandage 94 (19.3) 73 (18.5) 167 (18.9)
 Plaster immobilisation 243 (49.9) 190 (48.1) 433 (49.1)
 Reduction and plaster immobilisation 94 (19.3) 82 (20.8) 176 (19.9)
 Primary operative 18 (3.7) 17 (4.3) 35 (4.0)
 Unknowng 0 5 (1.3) 5 (0.6)
  1. Abbreviations: IQR interquartile range, FOOSH fall on outstretched hand
  2. aData from the academic hospital, the derivation cohort
  3. bData from the other four hospitals, the validation cohort
  4. cThe final derivation cohort
  5. dFracture of the distal radius, distal ulna or one of the carpal bones
  6. ePercentage of total number of patients. Because some patients had multiple fractures, the total number of different fractures is not equal to number of patients with a wrist fracture
  7. fTreatment for patients with and without fractures
  8. gNot recorded in patients files