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Table 5 Regression analysis for the two part model of log costs: Regression coefficients and t statistics

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

  Adults and children combined p Adults p Child p
Comorbidity 0.13 <.01 0.13 <.01 0.15 <.01
  (16.66)   (14.89)   (6.68)  
Age 0.00286 <.01 0.00059   -0.00466  
  (5.62)   (0.52)   (1.76)  
Female 0.00   0.04   -0.05  
  (0.00)   (1.22)   (1.91)  
Mental illness 0.19   0.16   0.32  
  (4.19) <.01 (3.09) <.01 (2.98) <.01
Addiction 0.15   0.13   0.42  
  (2.46) <.05 (1.91)   (2.13) <.05
Pregnancy 1.02   0.95   1.48  
  (17.28) <.01 (14.49) <.01 (4.93) <.01
Intercept 2.23   2.33   2.29  
  (120.44) <.01 (40.47) <.01 (83.58) <.01
R 2 0.21   0.20   0.06  
N 3,427   1,881   1,546  
  1. Observed log10 Total Cost regression coefficients from a two part regression model (equations (1) and (2) in the Appendix). The coefficients for the zero inflation part of the two part model are not displayed. T-statistics are in parentheses.