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