|
Characteristics included in the PUFHSa
|
Scores
|
Estimatesb
|
|---|
|
Intercept
| |
− 2.67
|
|
Primary cancer types
|
|
Slow growth
|
1
|
0.26
|
|
Moderate growth
|
2
|
|
Rapid growth
|
3
|
|
Number of treated vertebrae levels
|
|
1
|
1
|
0.65
|
|
2
|
2
|
|
3
|
3
|
|
≥ 4
|
4
|
|
Vertebrae collapse
|
|
No collapse
|
1
|
−0.30
|
|
Less than 50%
|
2
|
|
More than 50%
|
3
|
- Notes: The PUFHS was created as follows:
- P(Y = 1) = e−2.67 + 0.26x1 + 0.65x2 − 0.30x3 / (1+ e−2.67 + 0.26x1 + 0.65x2 − 0.30x3); x 1 indicates primary cancer types; x 2 indicates number of treated vertebrae levels; x 3 indicates vertebrae collapse
- An example was given as follows: if a spine metastasis patient with rapid growth cancer (3 points) had more than 50% vertebrae collapse (3 points) and one treated vertebra level (1 point), the vascular cement leakage probability of the patient was P (Y = 1) = e−2.67 + 0.26 ∗ 3 + 0.65 ∗ 1 − 0.30 ∗ 3 / (1+ e−2.67 + 0.26 ∗ 3 + 0.65 ∗ 1 − 0.30 ∗ 3) = 10.53%
- Abbreviations: PUFHS Peking University First Hospital Score
- aindicates characteristics were included according to the Least Absolute Shrinkage and Selection Operator; bindicates estimates were calculated from logistic regression analysis
