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The coefficient for the interaction term for time period and intervention status is a measure of the difference in differences between census tracts with and without SRTS interventions from the pre-changepoint to the post-changepoint time period.
The researchers could correctly guess the intervention status in 65.4% (53) of the families who enrolled.
In order to evaluate the masking process, researchers were asked to guess the intervention status.
Data operators were unaware of intervention status.
Participants had annual assessments by personnel blinded to intervention status.
Furthermore, assessors were not blinded to intervention status; blinding is more difficult in non-drug trials.
P1 is a dummy variable indicating the intervention status of yearly maximum reimbursement amount.
Pi is a dummy variable indicating the intervention status of the county's outpatient reimbursement rates.
Consequently, the intervention and comparison groups should be identical, except for the intervention status.
However, in some cases the referral letter revealed the intervention status.
Trained outcome assessors who perform the interviews by telephone are masked for intervention status.
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