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Table 6 Quantile regression analysis of correlates of the top 10% and top 5% of costs: Regression coefficients and t statistics

From: Medicaid managed care: how to target efforts to reduce costs

  Top 10% combined   Top 5% combined   Top 10% of adults   Top 10% child  
  Adult and child p Adult and child p   p   p
Comorbidity 0.19   0.21   0.18   0.33  
  (10.83) <.01 (7.01) <.01 (10.67) <.01 (3.70) <.01
Age 0.004   0.00089   0.00111   -0.02751  
  (3.33) <.01 (0.45)   (0.49)   (2.58) <.01
Female -0.02   -0.05   -0.05   -0.12  
  (0.43)   (0.66)   (0.91)   (1.09)  
Mental illness 0.21   0.10   0.21   0.42  
  (1.86)   (0.53)   (1.98) <.05 (0.96)  
Addiction 0.20   0.11   0.23   0.48  
  (1.37)   (0.45)   (1.71)   (0.60)  
Pregnant 0.93   0.77   0.87   0.98  
  (6.68) <.01 (3.33) <.01 (6.69) <.01 (0.82)  
Intercept 2.83   3.24   3.03   3.43  
  (64.43) <.01 (44.43) <.01 (26.50) <.01 (31.06) <.01
Pseudo R 2 0.15   0.12   0.16   0.07  
N 3,427   3,427   1,881   1,546  
  1. Observed log10 Total Cost regression coefficients from quantile regressions. The coefficients for the zero inflation part of the two part model are not displayed. T-statistics are in parentheses.