Table 1.
Description of Variables
| Dependent variables |
| HSCT = 1 if the patient received hematopoietic stem cell transplantation (ICD-9-CM procedure codes 41.01, 41.02, 41.03, 41.04, 41.05, 41.07, 41.08, 41.09); = 0 otherwise |
| DEATH = 1 if the patient died during the time period; = 0 otherwise |
| Insurance coverage |
| MEDI-CAL = 1 if the patient’s insurance coverage is Medi-Cal; = 0 if not |
| MEDICARE = 1 if the patient’s insurance coverage is Medicare; = 0 if not |
| PRIVATE* = 1 if the patient’s insurance coverage is private commercial; = 0 if not |
| SELF PAY = 1 if the patient has no insurance coverage; = 0 if not |
| OTHERINS = 1 if the patient has other insurance coverage such as workers compensation; = 0 if not |
| SWITCH = 1 if the patient switched insurance coverage to more generous insurance; = 0 if not |
| Demographics |
| AGE = patient’s age measured in years |
| FEMALE = 1 if patient is female; = 0 if patient is male |
| WHITE* = 1 if patient’s race is white; = 0 if not |
| BLACK = 1 if patient’s race is African American; = 0 if not |
| ASIAN = 1 if patient’s race is Asian; = 0 if not |
| RACEOTHER = 1 if patient’s race is other than white, black or Asian; = 0 if not |
| RACEMISS = 1 if patient’s race is missing; = 0 if not |
| Disease type—leukemia |
| Acute Lymphocytic Leukemia*= 1 if patient’s diagnosis is acute lymphocytic leukemia (ICD-9-CM diagnosis codes 204.0, 204.01) = 0 if not |
| Acute Myeloid Leukemia = 1 if patient’s diagnosis is acute myeloid leukemia (ICD-9-CM diagnosis codes 205.0, 205.01, 205.8, 205.81, 205.9, 205.91); = 0 if not |
| Chronic Lymphocytic Leukemia = 1 if patient’s diagnosis is chronic lymphocytic leukemia (ICD-9-CM diagnosis codes 204.1, 204.11, 204.8. 204.81. 204.9, 204.91); = 0 if not |
| Chronic Myeloid Leukemia= 1 if patient’s diagnosis is chronic myeloid leukemia (ICD-9-CM diagnosis codes 205.1, 205.11); = 0 if not |
| UNSPECIFIED = 1 if patient’s diagnosis is other acute or chronic leukemia (ICD-9-CM diagnosis codes 202.4, 205.20, 205.31, 206.0, 206.01, 206.1, 206.11, 206.8, 206.81, 206.9, 206.91, 207.0, 207.01, 207.1, 207.11, 207.20, 207.21, 207.80, 208.0, 208.01, 208.1, 208.11, 208.80, 208.81, 208.9, 208.91, V10.60, V10.61, V10.62, V10.63, V10.69); = 0 if not |
| Disease type—lymphoma |
| NON-HODGKIN = = 1 if the patient’s diagnosis is non-Hodgkin lymphoma (ICD-9-CM diagnosis 200.00–200.08, 200.10–200.18, 200.20–200.28, 200.80–200.88, 202.00–202.08, 202.80–202.88, 202.90–202.98) |
| = 0 if Hodgkin lymphoma (ICD-9-CM diagnosis codes 200.00–200.08) |
| Comorbid conditions† |
| ANEMIA = 1 if patient ever had anemia or other diseases of the blood (excluding leukemia and lymphoma; = 0 if not |
| CANCER = 1 if patient ever had cancer other than leukemia or lymphoma; = 0 if not |
| CIRCULATE = 1 if patient ever had a disease of the circulatory system; = 0 if not |
| DIGESTIVE = 1 if patient ever had a disease of the digestive system; = 0 if not |
| URINARY = 1 if patient ever had a disease of the urinary or genital system; = 0 if not |
| INFECTIOUS = 1 if patient ever had an infectious or parasitic disease; = 0 if not |
| INJURY = 1 if patient ever had an injury or poisoning; = 0 if not |
| MENTAL = 1 if patient ever had a mental disorder; = 0 if not |
| MUSCLE = 1 if patient ever had a disease of the musculoskeletal system; = 0 if not |
| NERVOUS = 1 if patient ever had a disease nervous system; = 0 if not |
| RESPIRATORY =1 if patient ever had a disease of the respiratory system; = 0 if not |
| DERM = 1 if patient ever had a skin disorder; = 0 if not |
| Hospital characteristics |
| HOSPLARGE = 1 if patient was treated at a hospital with more than 475 beds; = 0 if not |
| HOSPMEDIUM = 1 if patient was treated at a hospital with 200 to 474 beds; = 0 if not |
| HOSPSMALL* = 1 if patient was treated at a hospital with less than 200 beds; = 0 if not |
| TEACH* = 1 if patient was treated at a teaching hospital; = 0 if not |
| GOVERNMENT = 1 if patient was treated at a government (state/local) hospital; = 0 if not |
| FOR-PROFIT = 1 if patient was treated at a for-profit hospital; = 0 if not |
| NONPROFIT* = 1 if patient was treated at a nonprofit hospital; = 0 if not |
| Instruments |
| DISTLT10* = 1 if distance from the patient’s zip code of residence to the nearest hospital that performs HSCT is less than 10 miles; = 0 if not |
| DIST10-35 = 1 if distance from the patient’s zip code of residence is at least 10 miles but less than 35 miles; = 0 if not |
| DIST35-70 = 1 if distance from the patient’s zip code of residence is at least 35 miles but less than 70 miles; = 0 if not |
| DIST70 = 1 if distance from the patient’s zip code of residence is greater than or equal to 70 miles; = 0 if not |
| MHINCOME = median household income (2002) in the county where the patient resides; expressed in 10,000s of dollars |
| %BACHDEG = measures the percentage of the population (aged 25 and over) in the county where the patient resides who hold a bachelor’s degree (2002) |
| %UNEMPLOY = measures the unemployment rate (2002) in the county where the patient resides |
*
Indicates the category is the reference group in the regression analysis.
†
Reference category identifies patients who have no comorbid conditions.