Skip to main content

Table 3 Interrupted time series (ITS) segmented regression analysis: difference-in-difference (DID) estimates, comparing treatment (dual-eligibles enrolled in D-SNP) vs. comparator (individuals 60–64 enrolled in Medicaid Managed Care) on changes in monthly utilization time trends associated with DSNP Regulations

From: The impact of Dual Eligible Special Need Plan regulations on healthcare utilization

 

Post Period (vs. Pre Period)

Sample

Outcome

DID LevelA

P-Value

DID SlopeB

P-Value

Total1

Any Hospitalization

−0.41%

0.19

−0.02%

0.39

Any ED Visit

−0.70%

0.07

0.00%

0.90

  1. Notes: Linear regression used for utilization outcomes. Sample is person-months from 2010 to 2015. Regression covariates include Group (treatment vs. comparator); a linear monthly time trend, indicators and splines for the post period (2012–2015); and the interactions between these variables. Other covariates included sex, age, race (full sample model only), indicator for SSI status, 18 comorbidity indicators, and state fixed effects. Repeated measures adjusted for using Huber-White robust standard errors, clustering at the person level. 1. N = 360,405
  2. A. Difference between treatment vs. comparator in the discontinuity (change in level) for the post period, measured using the interaction between Group & an indicator variable for the post period
  3. B. Difference between treatment vs. comparator in the change in slope for the post period, measured using the interaction between Group & a spline variable for the post period
Back to article page

BMC Health Services Research

ISSN: 1472-6963

Contact us