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Table 1 Comparison of preoperative demographic data between traditional guide instrument group and designed guide instrument group

From: A new tool in percutaneous anterior odontoid screw fixation

Characteristics Statistics P value
Traditional guide instrument Designed guide instrument
Patients (n) 13 16  
Age (years) 49.31 ± 10.90 47.94 ± 11.89 0.751
Cause of injury (n) 0.573
 Traffic accidents 5 4  
 Fall from height 6 7  
 Falls from standing 2 5  
Fracture type (n) 0.715
 Type II A 7 7  
 Type II B 6 9  
 Type II C 0 0  
Associated spinal cord injury (n)    1.000
 ASIA Grade C 0 1  
 ASIA Grade D 3 3  
Associated C1 fracture (n) 3 4 1.000
Time between trauma and operation (d) 3.77 ± 1.74 3.50 ± 1.37 0.644
Follow-up duration (months) 15.38 ± 9.67 16.75 ± 10.28 0.718