Increased Fracture Collapse after Intertrochanteric Fractures Treated by the Dynamic Hip Screw Adversely Affects Walking Ability but Not Survival
Table 4
Ordinal regression of factors which predicted better functional walking status after rehabilitation. Value with a positive (+) estimate predicts better walking status and that with a negative (−) estimate predicts a worse outcome.
Estimated likelihood of having better walking function in ordinal regression
Estimate
Standard error
Wald
df
Sig.
95% confidence interval
Per day delay from admission to operation
0.069
0.194
0.126
1.000
0.722
−0.311
0.448
Operative time per minute increase
0.003
0.009
0.085
1.000
0.771
−0.014
0.020
Age at operation per year increase
−0.051
0.024
4.421
1.000
0.036
−0.099
−0.003
MMSE per mark increase
0.086
0.023
13.344
1.000
0.000
0.040
0.132
MBI per mark increase
0.021
0.008
6.587
1.000
0.010
0.005
0.037
Poor premorbid walking status (independent versus assisted versus dependent)
1.665
0.323
26.565
1.000
0.000
1.032
2.297
Poor reduction quality (good versus acceptable versus poor)
0.331
0.275
1.444
1.000
0.230
−0.209
0.871
Collapse grade (minimal versus moderate versus severe)
−0.650
0.256
6.445
1.000
0.011
−1.151
−0.148
Male versus female
−0.213
0.292
0.530
1.000
0.467
−0.786
0.360
31.A1 class versus A2
0.072
0.291
0.061
1.000
0.804
−0.498
0.642
Screw versus blade
−0.105
0.298
0.124
1.000
0.724
−0.690
0.480
Operated by specialists (>6 years of experience)
0.090
0.321
0.078
1.000
0.780
−0.540
0.719
ASA 1-2 versus 3-4
0.280
0.306
0.840
1.000
0.359
−0.319
0.880
No mechanical failure
0.787
0.684
1.326
1.000
0.250
−0.553
2.127
Not reoperated
1.779
1.046
2.890
1.000
0.089
−0.272
3.830
No lateral wall fracture
−0.476
0.526
0.820
1.000
0.365
−1.506
0.554
Suboptimal tip-apex distance > 25 mm
22.688
0.000
—
1.000
—
22.688
22.688
Suboptimal centre-centre or centre-inferior lag screw position
−0.695
0.299
5.392
1.000
0.020
−1.282
−0.108
Pseudo -square (Nagelkerke) = 0.504
Not enough valid cases to compute the significance of this item.
