Predicting the Failure Risk of Internal Fixation Devices in Chinese Patients Undergoing Spinal Internal Fixation Surgery: Development and Assessment of a New Predictive Nomogram
Table 1
Differences in characteristics between normal and failure groups of spinal instrumentation devices in the training test.
Demographic characteristics
Normal group
Failure group
Overall
()
()
()
Gender
Female
370 (49.7%)
33 (60.0%)
403 (50.4%)
Male
374 (50.3%)
22 (40.0%)
396 (49.6%)
Age
< =45
211 (28.4%)
32 (58.2%)
243 (30.4%)
>45
533 (71.6%)
23 (41.8%)
556 (69.6%)
BMI
<18.5
75 (10.1%)
16 (29.1%)
91 (11.4%)
18.5-24.9
461 (62.0%)
28 (50.9%)
489 (61.2%)
25-29.9
184 (24.7%)
9 (16.4%)
193 (24.2%)
> =30
24 (3.2%)
2 (3.6%)
26 (3.3%)
Diagnosis
Scoliosis
26 (3.5%)
16 (29.1%)
42 (5.3%)
Spinal fracture
77 (10.3%)
6 (10.9%)
83 (10.4%)
Spinal tumors
107 (14.4%)
4 (7.3%)
111 (13.9%)
Spinal tuberculosis
41 (5.5%)
4 (7.3%)
45 (5.6%)
Spinal degeneration
493 (66.3%)
25 (45.5%)
518 (64.8%)
Scoliosis
No
718 (96.5%)
39 (70.9%)
757 (94.7%)
Yes
26 (3.5%)
16 (29.1%)
42 (5.3%)
Number of screws/number of vertebral bodies spanned
