Table. Trend Models for ED Visits and Hospitalizations.
| Dependent Variable | Model | Slope 1 (pa) | Join Point | Slope 2 (pa) | P Valueb |
|---|---|---|---|---|---|
| Trend models for % of ED visits by insurance type | |||||
| % Private insurance visits | Linear | −0.8 (0.00003) | NA | NA | .81 |
| % Medicare visits | 1 Join point | 2.1 (0.11) | 2008 | 0.06 (0.63) | .02 |
| % Medicaid visits | Linear | 0.9 (0.004) | NA | NA | .18 |
| % Uninsured visits | 1 Join point | −0.2 (0.11) | 2013 | −2.1 (0.003) | .001 |
| Trend models for No. of ED visits by insurance type | |||||
| Total No. of ED visits | Linear | 2.3 (0.0005) | NA | NA | .49 |
| No. of private insurance visits | Linear | −0.4 (0.07) | NA | NA | .30 |
| No. of Medicare visits | 1 Join point | 3.4 (0.05) | 2008 | 0.4 (0.02) | .02 |
| No. of Medicaid visits | Linear | 1.8 (0.0007) | NA | NA | .24 |
| No. of uninsured visits | 1 Join point | 0.04 (0.86) | 2013 | −2.6 (0.03) | .005 |
| Trend models for % of hospital discharges by insurance type | |||||
| % Private insurance visits | Linear | −0.5 (0.00008) | NA | NA | .30 |
| % Medicare visits | Linear | 0.3 (0.0006) | NA | NA | .56 |
| % Medicaid visits | Linear | 0.4 (0.0003) | NA | NA | .38 |
| % Uninsured visits | 1 Join point | −0.03 (0.61) | 2013 | −0.6 (0.04) | .02 |
Abbreviations: ED, emergency department; NA, not applicable.
a
The numbers in parentheses indicate the significance level of alternative hypothesis that the slope does not equal 0 vs null hypothesis that the slope is 0. Slopes indicate change per year in percentage points.
b
Significance of alternative hypothesis of 1 join point vs null hypothesis of 0 join points (straight line). Slopes indicate change per year in percentage points.