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Table 2 Comparison of patient characteristics between the two groups

From: Analysis on risk factors for neck shortening after internal fixation for Pauwels II femoral neck fracture in young patients

Factors n Shortening group Non-shortening group χ2 p
Age (years)
 18–44 65 14 51 5.086 0.024
 45–59 57 23 34   
Sex
 Male 83 30 53 4.157 0.041
 Female 39 7 32   
BMD
 T > − 2.5 75 17 58 5.408 0.020
 T ≤ − 2.5 47 20 27   
BMI (kg/m2)
 < 24.0 60 12 48 8.745 0.012
 24.0 ≤ BMI < 28.0 44 15 29   
 ≥ 28.0 18 10 8   
Fracture type
 Type I, II 33 19 14 15.895 0.000
 Type III, IV 89 18 71   
Posterior medial cortex comminution
 Yes 82 32 50 8.952 0.002
 No 40 5 35   
Reduction quality
 Grade I, II 77 15 62 11.625 0.000
 Grade III, IV 45 22 23   
Surgical time (h)
 ≤ 24 79 23 56 0.156 0.692
 > 24 43 14 29   
Time to weight-bearing (months)
 ≤ 2 91 27 64 0.073 0.787
 > 2 31 10 21   
Hospitalization time (week)
 ≤ 1 75 22 53 0.091 0.762
 > 1 47 15 32