Skip to main content

Table 2 The effects (point estimate [95% confidence interval]) of eight major factor variables on episode expenditures varied across the 10th, 25th, 50th, 75th and 90th quantile of the expenditure distribution. Effects are measured in thousands of dollars

From: Identifying and understanding determinants of high healthcare costs for breast cancer: a quantile regression machine learning approach

  10th quantile 25th quantile 50th quantile 75th quantile 90th quantile
(Intercept) −4.5 (−14.4, − 1.6) −3.3 (−6.6, − 1.4) −3.2 (−7.7, 2.4) 3.1 (−3.6, 14.0) 8.7 (−7.1, 15.9)
Chemotherapy drugs (ref = Part D) (n = 2110)
 Part B (n = 828) 9.5 (8.1, 10.9) 16.3 (14.0, 18.6) 25.0 (23.0, 27.1) 40.6 (37.7, 43.5) 47.8 (43.9, 51.7)
Chemotherapy clean period (days, ref = 62–730) (n = 1235)
  > 730 (n = 657) 0.1 (− 0.2, 0.2) 0.3 (0.1, 0.5) 0.6 (0.2, 0.9) 1.5 (0.5, 2.4) 3.7 (1.6, 5.5)
 1–61 (n = 1046) 0.1 (0.0, 0.3) 0.5 (0.3, 0.7) 0.8 (0.4, 1.3) 1.7 (0.9, 2.7) 6.2 (3.3, 9.6)
Radiation (ref = No) (n = 2681)
 Yes (n = 257) 3.8 (2.5, 4.9) 6.4 (4.5, 7.3) 7.2 (5.8, 8.8) 7.1 (5.2, 10.3) 9.2 (5.2, 13.6)
Insurance (ref = No PartDa) (n = 127)
 PartD LISb (n = 130) 2.4 (− 0.8, 4.9) 2.7 (− 0.2, 5.8) 4.3 (1.7, 9.3) 3.1 (− 0.5, 10.4) 0.7 (−3.4, 13.1)
 PartD NoLISc (n = 1794) 2.7 (− 0.6, 5.7) 2.9 (− 0.2, 6.0) 3.6 (0.3, 8.3) 0.8 (− 2.5, 9.3) − 0.8 (−4.1, 5.3)
 Full duald (n = 887) 3.2 (0.1, 6.1) 3.9 (0.9, 7.0) 5.2 (2.0, 10.1) 4.3 (0.8, 12.9) 2.8 (−0.1, 10.3)
Comorbidities (ref = 0) (n = 828)
 1 (n = 727) 0.2 (0.1, 0.3) 0.3 (0.1, 0.5) 0.5 (0.3, 0.8) 0.8 (0.1, 1.6) 0.5 (−1.2, 2.1)
 2 (n = 469) 0.6 (0.3, 0.9) 1.0 (0.7, 1.3) 1.3 (1.0, 1.7) 1.8 (1.1, 3.0) 1.5 (0.3, 3.1)
 3 (n = 288) 0.8 (0.5, 1.1) 1.3 (0.8, 1.6) 1.5 (1.0, 2.2) 3.2 (1.1, 4.6) 3.3 (1.3, 7.5)
  ≥ 4 (n = 271) 1.4 (0.9, 1.8) 1.7 (1.2, 2.3) 3.1 (2.2, 4.8) 4.2 (2.5, 5.7) 6.2 (4.3, 7.8)
 New enrollee (n = 355) 0.0 (−0.4, 0.3) 0.4 (−0.1, 0.8) 0.4 (0.1, 0.9) −0.2 (−1.1, 0.8) 1.2 (− 1.0, 4.6)
HRR relative cost (in 30) 0.1 (0.0, 0.2) 0.4 (0.1, 0.7) 0.8 (0.4, 1.2) 1.2 (0.8, 1.6) 1.8 (1.0, 2.7)
Age (10 years) −0.1 (− 0.2, 0.0) −0.2 (− 0.3, 0.1) −0.7 (−1.1, − 0.3) − 1.2 (− 1.7, − 0.8) − 1.8 (− 2.2, − 1.2)
Surgery (ref = No) (n = 2818)
 Yes (n = 120) 5.2 (3.7, 6.5) 5.6 (4.7, 6.4) 6.7 (5.1, 7.9) 6.8 (4.7, 10.3) 8.6 (5.0, 13.8)
  1. Note: aNo PartD means no part D enrollment for prescription drug coverage; bPartD LIS means does not have full Medicaid benefits but does have Part D with low income subsidy; cPartD NoLIS means has Part D enrollment but no low income subsidy; dFull dual means full Medicaid benefits (including Part D and LIS)