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Table 2 Comparison of patients with missing or non-assessable variables for HISS classification and patients with complete data

From: Evaluation of the Scandinavian guidelines for head injuries based on a consecutive series with computed tomography from a Norwegian university hospital

Characteristics Classified according to HISS N = 960 Not classified according to HISS N = 365 p-values
Questionnaire responders    
 Yes 855 (89.1%) 128 (35.1%) <0.001
Time of CT examination    
 Weekend/Holiday 446 (46.5%) 105 (28.2%) <0.001
Trauma mechanism    
 Injury while being hospitalized 5 (0.5%) 29 (8.0%) <0.001
Male 581 (60.5%) 173 (47.4%) <0.001
Age    
 Median 30 years 52 years <0.001
Clinical affiliation of CT ordering doctor    <0.001
 GP emergency clinic (in hospital) 322 (33.5%) 74 (20.3%)  
 Neurosurgical department 167 (17.4%) 20 (5.5%)  
 Other hospital department 102 (10.6%) 147 (40.3%) <0.001
 Trauma team 309 (32.2%) 8 (2.2%)  
 External GP (not in hospital) 60 (6.3%) 116 (31.8%)  
CT findings    
 Traumatic findings (%) 91 (9.5%) 12 (3.3%) <0.001
Admittance to hospital?    
 Yes 593 (61.8%) 196 (53.7) 0.007
Neurosurgical intervention?    
 Yes 12 (1.3%) 0 (0%) 0.027