Increased Fracture Collapse after Intertrochanteric Fractures Treated by the Dynamic Hip Screw Adversely Affects Walking Ability but Not Survival
Table 3
Ordinal regression of factors which predicted increasing severity of collapse. Value with a positive (+) estimate predicts more fracture collapse and that with a negative (−) estimate predicts less.
Estimated likelihood of increased fracture collapse in ordinal regression
Estimate
Standard error
Wald
df
Sig.
95% confidence interval
Per day delay from admission to operation
−0.121
0.191
0.401
1.000
0.527
−0.496
0.254
Operative time per minute increase
0.021
0.008
6.484
1.000
0.011
0.005
0.037
Age at operation per year increase
0.049
0.023
4.369
1.000
0.037
0.003
0.095
MMSE per mark increase
0.025
0.023
1.182
1.000
0.277
−0.020
0.071
MBI per mark increase
0.007
0.008
0.701
1.000
0.402
−0.009
0.023
Poor premorbid walking status (independent versus assisted versus dependent)
−0.278
0.282
0.974
1.000
0.324
−0.831
0.274
Poor reduction quality (good versus acceptable versus poor)
1.112
0.240
21.510
1.000
0.000
0.642
1.582
Male versus female
−0.680
0.302
5.067
1.000
0.024
−1.271
−0.088
31.A1 class versus A2
−0.719
0.281
6.570
1.000
0.010
−1.269
−0.169
Screw versus blade
−0.156
0.284
0.301
1.000
0.583
−0.712
0.401
Operated by specialists (>6 years of experience)
0.360
0.311
1.338
1.000
0.247
−0.250
0.971
Suboptimal centre-centre or centre-inferior lag screw position
