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Table 2 Comparative ITS analysis examining the ACA policy impact on SNAP participation among low-income older Medicare enrollees

From: Impact of the Affordable Care Act on participation in the Supplemental Nutrition Assistance Program among low-income older Medicare beneficiaries

  

SNAP participation

Parameter

Interpretation

β

P

SEa

t

Timeb

Control Pre–Trend

0.11

< .001

.001

7.97

Interruptionc

Control Post–Level Change

− 0.032

.52

.007

− 1.38

Time∙Interruptiond

Control Post–Trend Change

− 0.252

< .001

.002

− 11.33

Treatmente

Treatment/Control Pre–Level Difference

1.311

< .001

.028

7.64

Treatment∙Timef

Treatment/Control Pre–Trend Difference

− 0.013

.72

.008

1.23

Treatment∙Interruptiong

Treatment/Control Post–Level Difference

− 0.039

.78

.032

− 0.14

Treatment∙Interruption∙Timeh

Treatment/Control Change in Slope Difference Pre– to Post–

0.174

< .001

.011

1.07

  1. Low-income status was determined at ≤ 138% of FPL
  2. Abbreviations. ITS interrupted time series, ACA Affordable Care Act, SNAP Supplemental Nutrition Assistance Program, β unstandardized beta coefficient, P p-value, SE standard error, t t-statistic, FPL Federal Poverty Level
  3. aNewey-West autocorrelation adjusted standard error
  4. bThe coefficient of ‘Time’ indicates the trend (or slope) in the probability of SNAP participation in the low-income younger group before interruption/intervention
  5. cThe coefficient of ‘Interruption’ shows the level change in the likelihood of SNAP participation right after the interruption/intervention in the low-income younger group
  6. dThe coefficient of ‘Time∙Interruption’ indicates the trend (or slope) change in the probability of SNAP participation after the interruption in the low-income younger group
  7. eThe coefficient of ‘Treatment’ shows the level difference in the probability of SNAP enrollment before the intervention between the low-income older Medicare group and the low-income younger group
  8. fThe coefficient of ‘Treatment∙Time’ indicates the trend (or slope) difference in the probability of SNAP participation before intervention between the low-income older Medicare group and the low-income younger group
  9. gThe coefficient of ‘Treatment∙Interruption’ shows the level difference in the probability of SNAP enrollment between the low-income older Medicare group and the low-income younger group
  10. hThe coefficient of ‘Treatment∙Interruption∙Time’ indicates the change in slope difference in the likelihood of SNAP participation between the low-income older Medicare group and the younger group with low incomes
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BMC Health Services Research

ISSN: 1472-6963

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