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Table 4 Relationship between disease characteristics and progression analyzed by Binary logistic regression models

From: The clinical and radiographic characteristics of avascular necrosis after pediatric femoral neck fracture: a systematic review and retrospective study of 115 patients

Parameters ARCO stage OR (95% CI) of collapsed stage Adjusted-OR (95% CI) of collapsed stage *
Total II IIIA IIIB IIIC
Age (years, n)       0.91 (0.72–1.16)  
 ≤ 11 17 4 5 3 5   
 12 13 3 4 2 4   
 13 20 10 4 2 4   
 14 25 9 9 2 5   
 15 24 8 9 2 5   
 ≥ 16 16 6 3 5 2   
Sex (n)       0.86 (0.37–1.96)  
 Male 78 28 25 10 15   
 Female 37 12 9 6 10   
Symptomatic (n)       10.24 (4.17–25.1) ** 6.25 (2.39–16.36) **
 No 47 30 12 3 2   
 Yes 68 10 22 13 23   
Interval between fracture and AVN diagnosis (n)       1.49 (0.81–2.73)  
 Within 1 year 71 27 20 11 13   
 1 to 2 years 32 11 10 4 7   
 More than 2 years 12 2 4 1 5   
JIC classification (n)       5.08 (2.54–10.12) ** 3.41 (1.62–7.17) **
 A/B 13 12 1 0 0   
 C1 40 17 21 1 1   
 C2 62 11 12 15 24   
Ratliff classification (n)       0.15 (0.06–0.37) **  
 I 50 7 8 12 23   
 II 61 29 26 4 2   
 III 4 4 0 0 0   
  1. ARCO Association Research Circulation Osseous, AVN avascular necrosis, JIC Japanese Investigation Committee
  2. *Multivariate analysis with method of “Forward LR”
  3. **p < 0.05