# Enabling Decision Making with the Modified Causal Forest: Policy Trees for Treatment Assignment
## Appendix A \begin{table}
\begin{tabular}{l l} \hline \hline
**Variable** & **Description** \\ \hline addl3 pc & index of activities of daily living 2 weeks prior to admission \\ age & age in years \\ alb1 & albumin level in grams per deciliter \\ amink & indicator for definite myocardial infarction \\ aps1 & acute physiology and chronic health evaluation score (APACHE III) \\ bili1 & bilirubin level in milligrams per deciliter \\ ca & cancer; 3 categories: metastatic cancer (Metastatic), no cancer (No), \\ cancer (Yes) & cancer (Yes) \\ card & indicator for cardiovascular diagnosis \\ indicator for acute myocardial infarction, peripheral vascular disease, \\ cardiox & severe, and very severe cardiovascular symptoms (NYHA-classes III and IV) \\  & primary disease; 9 categories: acute respiratory failure (0), congestive \\  & heart failure (1), chronic obstructive pulmonary disease (2), cirrhosis (3), \\ cat1 & colon cancer metastatic to the liver (4), non-traumatic coma (5), \\  & non-small-cell cancer of the lung, stage III or IV (6), multiorgan system \\  & failure with malignancy (7), indicator for multiorgan system failure with \\  & sepsis (8) \\  & secondary disease; 3 categories: missings or others (0), multiorgan \\ cat2 & system failure with malignancy (1), multiorgan system failure with \\  & sepsis (2) \\ cat2\_miss & indicator for missings in cat2 \\ chfhx & indicator for congestive heart failure \\ chrpulhx & indicator for chronic, severe, or very severe pulmonary disease \\ crea1 & creatinine level in milligrams per deciliter \\ das2d3 pc & Duke activity status index (DASI) two weeks before admission \\ dementhx & indicator for dementia, stroke or cerebral infarct, Parkinson’s disease \\ dr1 & indicator for do not resuscitate status on the first day \\ dth30 & outcome indicator for mortality within 6 months \\ edu & education in years \\ gastr & indicator for gastrointestinal diagnosis \\ gibledhx & indicator for upper gastrointestinal bleeding \\hema & indicator for hematologic diagnosis \\hema1 & hematocrit levels in percent \\ hrt1 & heart rate in beats per minute \\  & indicator for immunos Suppression, organ transplant, HIV positivity, \\ immunhx & diabetes mellitus with or without end organ damage, connective tissue \\  & disease \\ income & income in US dollars; 4 categories: below 11 k (0), 11–25 k (1), 25–50 k (2), \\  & above 50 k (3) \\ liverhx & indicator for cirrhosis, hepatic failure \\ malignbx & indicator for solid tumor, metastatic disease, chronic leukemia/myeloma, \\  & acute leukemia, lymphoma \\ meanbp1 & mean blood pressure in millimeters of mercury \\ meta & indicator for metabolic diagnosis \\ neuro & indicator for neurological diagnosis \\  & medical insurance; 6 categories: Medicaid (0), Medicare (1), Medicare \\ ninsclas & and Medicaid (2), no medical insurance (3), private medical \\  & insurance (4), private medical insurance and Medicaid (5) \\ ortho & indicator for orthopedic diagnosis \\ paco21 & partial pressure of arterial carbon dioxide in millimeters of mercury \\  & ratio between partial pressure of arterial oxygen in millimeters of \\ paf1 & mercury and fraction of inspired oxygen \\ ph1 & potential of hydrogen (pH) at logarithmic scale \\ pot1 & blood potassium level in millimoles per liter \\ psychhx & indicator for psychiatric history, active psychosis or severe depression \\ race & race; 3 categories: African American (0), other race (1), Caucasian (2) \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Codebook for the right heart catheterisation study (Section 3.2).