Statistical Analysis
The main analysis was performed using multivariable linear regression.
The analysis was performed to determine the association between the
outcome variable, cost of cancer treatments, and covariates. For
sub-group analysis, we performed multivariable linear regressions based
on the patients’ socioeconomic status. All analyses were performed using
the SAS software, version 9.4 (SAS Institute, Cary, North Carolina,
USA).