Table 5.
Multivariable Logistic Regression of Factors Independently Associated With Pathologic Nodal Upstaging With Number of Assessed Nodes Modeled as Continuous Variable With Piecewise Linear Splines and Knot at Seven Nodes
| Variable | HR | 95% CI | P Value | |
|---|---|---|---|---|
| Lower | Upper | |||
| Age, per year | 1.01 | 0.98 | 1.03 | .53 |
| Sex, female | 0.93 | 0.65 | 1.34 | .71 |
| Race (reference: white) | ||||
| Black | 1.36 | 0.70 | 2.65 | .36 |
| Year of diagnosis, per year | 0.93 | 0.87 | 1.01 | .07 |
| CDCI score (reference: 0) | ||||
| 1 | 1.11 | 0.76 | 1.62 | .60 |
| 2+ | 0.86 | 0.49 | 1.51 | .60 |
| Insurance status (reference: private) | ||||
| Government | 0.92 | 0.60 | 1.42 | .72 |
| None | 0.49 | 0.06 | 4.12 | .51 |
| Facility type (reference: nonacademic) | ||||
| Academic/research program | 1.22 | 0.84 | 1.77 | .31 |
| Tumor size, per mm | 1.02 | 1.00 | 1.04 | .04 |
| Number of nodes assessed, per node | ||||
| <7 nodes | 1.01 | 0.91 | 1.13 | .79 |
| >7 nodes | 1.03 | 1.00 | 1.06 | .02 |
CDCI, Charlson-Deyo comorbidity index; CI, confidence interval; HR, hazard ratio.