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Table 2 Results of the stratified meta-analyses for operative time.

From: Comparative effectiveness research on proximal femoral nail versus dynamic hip screw in patients with trochanteric fractures: a systematic review and meta-analysis of randomized trials

Variable Trials (no.) ES 95% CI Tau^3 I^2 (modified)
All trials 12 − 9.4 − 19.98 1.18 311.9(*)  
Intervention      280.8  
 PFN 6 − 2.4 − 16.32 11.52 90% 88%
 PFNA 5 − 17.7 − 32.6 − 2.8   
Fracture pattern      383.1  
 Stable 4 − 6.2 − 28.94 16.54 123% 120%
                                  Unstable 5 − 900 − 26.44 8.44   
 Mix 3 − 13.1 − 35.44 9.24   
Follow-up      372.4  
 Short 2 − 1.5 − 28.55 25.55 119% 117%
                                  Intermediate 8 − 11,00 − 24.72 2.72   
 Long 2 − 12.8 − 52,00 26.4   
Country      532.14  
 China 4 − 20,00 − 46.26 6.26 171% 167%
                                  Finland 1 10,00 − 35.86 55.86   
                                  Greece 1 12,00 − 35.63 59.63   
 India 2 − 14.6 − 47.33 18.13   
                                  Pakistan 1 − 23.4 − 68.68 21.88   
                                  Switzerland 1 − 100 − 46.86 44.86   
                                  Turkey 1 − 12.5 − 57.78 32.78   
 UK 1 300 − 42.28 48.28   
Random sequence generation      293.4  
 Low 10 − 7.3 − 18.28 3.68 94% 92%
 High 0      
                                  Unclear 2 − 30.7 − 64.8 3.4   
Allocation concealment      256  
 Low 5 − 0.6 − 14.91 13.71 82% 80%
 High 0      
                                  Unclear 7 − 17.1 − 30.43 − 3.77   
Blinding of outcome assessment      344.5  
 Low 2 − 13.6 − 39.47 12.27 110% 108%
 High 0      
                                  Unclear 10 − 8.4 − 20.75 3.95   
Incomplete outcome data      311.9  
 Low 12 − 9.42 − 20,00 1.16 100% 98%
 High 0      
                                  Unclear 0      
Selective reporting      311.9  
 Low 12 − 9.42 − 20,00 1.16 100% 98%
 High 0      
                                  Unclear 0      
  1. * means p < 0.05; Caps () were used for annotating
  2. Abbreviations: ES effect size, CI confidence interval