Table 4 -.
Secondary Analysis: Multivariable Regression Analysis to Elucidate Factors Affecting Surgical Encounter Total Direct Costs
| Factor | Relative Costa–b | P - Value | |
|---|---|---|---|
| Coefficient | 95% Confidence Interval | ||
| Age (years)b | 1.00 | (1.00 • 1.01) | 0.36 |
| Anesthesia Type | |||
| Monitored Anesthesia Care (MAC) | Reference Category | - | - |
| General | 1.31 | (1.04 • 1.65) | < 0.05 |
| Surgical block + MAC | 0.92 | (0.72 • 1.17) | 0.49 |
| Provider | |||
| A | Reference Category | - | - |
| B | 1.61 | (1.37 • 1.89) | < 0.05 |
| C | 1.26 | (1.07 • 1.48) | 0.33 |
| D | 1.21 | (1.04 • 1.42) | 0.65 |
| Sex | |||
| Female | Reference Category | - | - |
| Male | 0.96 | (0.86 • 1.06) | 0.43 |
| Surgical Method | |||
| In situ decompression (ISD) | Reference Category | - | - |
| Transposition (SQT and SMT) | 1.18 | (1.04 • 1.35) | < 0.05 |
a
Relative Cost (RC): Gamma univariate regression coefficients (eβ). For example, a value of 1.6 is interpereted as a 60% increase in total direct costs as compared to the reference category. Bolded p-values were determined to be statistically-significant.
b
Note that anesthesia type and surgical methods are associated due to clinical practice patterns in which ISD is more likely to be performed under MAC, and transpositions performed under general anesthesia. By including both predictors, the effect of surgical method may be falsely lowered.
c
Per additional 1 year of age.