Table 2.
Comparison of unadjusted trends in ED Visits and IP Stays between PBHCI and Control Clinics, Waves 1 and 2.
| Utilization Measures | WAVE 1 | ||||||
|---|---|---|---|---|---|---|---|
| PBHCI Clinics (N=6,712) | Control Clinics (N=13,012) | Difference in Differences (PBHCI-Control) | |||||
| Pre (%) (10,745 PY) | Post (%) (20,378 PY) | Post-Pre | Pre (%) (20,805 PY) | Post (%) (39.033 PY) | Post-Pre | ||
| Emergency Department | |||||||
| Any ED Visit | 50.40% | 46.95% | −3.45% | 46.44% | 44.62% | −1.82% | −1.63%* |
| BH ED Visit | 12.63% | 10.18% | −2.45% | 10.23% | 8.76% | −1.47% | −0.98%* |
| Med ED Visit | 45.51% | 43.36% | −2.15% | 42.51% | 41.36% | −1.15% | −1.00% |
| 4 or More ED Visits | 8.37% | 8.41% | 0.04% | 7.38% | 7.39% | 0.01% | 0.03% |
| 4 or More BH ED Visits | 0.93% | 1.19% | 0.26% | 0.87% | 1.01% | 0.14% | 0.12% |
| 4 or More Med ED Visits | 7.74% | 7.72% | −0.02% | 6.79% | 6.74% | −0.05% | 0.03% |
| Inpatient | |||||||
| Any IP Stay | 24.53% | 21.64% | −2.89% | 20.36% | 17.58% | −2.78% | −0.11% |
| BH IP Stay | 10.96% | 8.56% | −2.40% | 7.83% | 6.43% | −1.40% | −1.00%* |
| Med IP Stay | 15.30% | 14.50% | −0.80% | 13.66% | 12.07% | −1.59% | 0.79%* |
| 3 or More IP Stays | 3.24% | 3.14% | −0.10% | 2.18% | 2.32% | 0.14% | −0.24% |
| 3 or More BH IP Stays | 1.80% | 1.63% | −0.17% | 1.01% | 1.07% | 0.06% | −0.23% |
| 3 or More Med IP Stays | 1.54% | 1.54% | 0.00% | 1.20% | 1.29% | 0.09% | −0.09% |
| WAVE 2 | |||||||
| Utilization Measures | PBHCI Clinics (N=1,881) | Control Clinics (N=11,514) | Difference in Differences (PBHCI Control) | ||||
| Pre (%) (2,507 PY) | Post (%) (2,464 PY) | Post-Pre | Pre (%) (17,524 PY) | Post (%) (17,246 PY) | Post-Pre | ||
| Emergency Department | |||||||
| Any ED Visit | 48.50% | 47.44% | −1.06% | 46.85% | 44.96% | −1.89% | 0.83% |
| BH ED Visit | 12.33% | 9.62% | −2.71% | 10.28% | 8.97% | −1.31% | −1.40% |
| Med ED Visit | 43.88% | 43.83% | −0.05% | 42.82% | 41.47% | −1.35% | 1.30% |
| 4 or More ED Visits | 7.82% | 8.20% | 0.38% | 7.60% | 7.66% | 0.06% | 0.32% |
| 4 or More BH ED Visits | 0.88% | 0.97% | 0.09% | 0.91% | 1.17% | 0.26% | −0.17% |
| 4 or More Med ED Visits | 7.42% | 7.67% | 0.25% | 7.03% | 6.92% | −0.11% | 0.36% |
| Inpatient | |||||||
| Any IP Stay | 20.38% | 19.24% | −1.14% | 19.36% | 16.86% | −2.50% | 1.36% |
| BH IP Stay | 8.78% | 7.02% | −1.76% | 7.59% | 6.22% | −1.37% | −0.39% |
| Med IP Stay | 12.84% | 13.64% | 0.80% | 12.73% | 11.43% | −1.30% | 2.10%* |
| 3 or More IP Stays | 3.15% | 3.17% | 0.02% | 2.28% | 2.30% | 0.02% | 0.00% |
| 3 or More BH IP Stays | 1.28% | 1.70% | 0.42% | 1.16% | 1.11% | −0.05% | 0.47% |
| 3 or More Med IP Stays | 1.91% | 1.50% | −0.41% | 1.16% | 1.24% | 0.08% | −0.49% |
ED=Emergency Department; IP=Inpatient; BH=Behavioral Health; Med=Medical; PY=Person-Years. Percents represent events per person year.
*
indicates that the DiD estimate is statistically significant at the p=.05 level accounting for within-person correlations and without covariate adjustment.