Table 3.
Generalized linear model of healthcare costs in United States patients (excluding outliers)
| Clinical Characteristic | Exponentiated estimate | 95% CI | p value |
|---|---|---|---|
| Intercept | 5908.22 | 2704.85 – 12,905.39 | <.0001 |
| Length of stay | 1.03 | 1.02–1.05 | <.0001 |
| Respiratory depression | 1.05 | 0.91–1.21 | .505 |
| Length of stay* Respiratory depression | 1.01 | 0.99–1.04 | .239 |
| Open Surgery (vs laparoscopic) | 0.88 | 0.77–1.01 | .067 |
| Length of surgery (hr) | <.0001 | ||
| ≥ 2 - < 4 vs. < 2 | 1.34 | 1.24–1.46 | |
| > 4 vs. < 2 | 1.89 | 1.69–2.12 | |
| BMI | .0011 | ||
| < 20 | 0.77 | 0.58–1.02 | |
| ≥ 20 - < 25 | – | – | – |
| ≥ 25 - < 30 | 0.90 | 0.80–1.00 | |
| ≥ 30 - < 35 | 1.01 | 0.90–1.14 | |
| ≥ 35 | 1.12 | 0.98–1.27 | |
| Procedure | <.0001 | ||
| Bone and joint | 1.22 | 0.94–1.59 | |
| Gastrointestinal | 1.01 | 0.78–1.31 | |
| Hepatobiliary | 1.30 | 0.94–1.80 | |
| Nervous system, skull and spine | 1.62 | 1.26–2.09 | |
| Obstetric and gynecological | 1.06 | 0.80–1.41 | |
| Renal and urinary tract | 1.93 | 0.97–3.87 | |
| Respiratory tract | 0.98 | 0.47–2.02 | |
| Therapeutic procedures and supportive care | – | – | – |
| Other | 1.36 | 0.89–2.09 | |
| Medicala | 0.42 | 0.33–0.54 | <.001 |
Scaled Deviance/Degree of Freedom (DF): 1.16
Scaled Pearson/DF: 1.25
Abbreviations: 95% CI 95% confidence interval, BMI body mass index
aEffect of medical procedure was estimated in a separate model due to the multicollinearity between length of surgery and medical patients