Figure 2. Multivariable linear and logistic regression analysis for outcomes in patients who underwent partial mastectomy for breast cancer.
Abbreviation: CI, confidence interval.
The coefficients and odds ratios were referenced to the Friday surgery. Multivariable regression analysis with adjustment for background characteristics was conducted using a generalized estimating equation to adjust for within-hospital clustering.

From: Association of Operative Day of the Week with the Length of Stay and Total Hospitalization Costs in Patients with Partial Mastectomy: A Nationwide Database Study in Japan