A distinction is also made between multiple interrupted time-series designs,which examine one group or site's preprogram and post-program outcomes over time,and single interrupted time-series designs,which contrast one group's performance with that of relevant comparison groups.

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A single interrupted time-series design examines one group or site's preprogram and post-program outcomes over time, without contrasting with a comparison group. Multiple interrupted time-series designs may involve comparisons across different groups or sites.

A Distinction Is Also Made Between Multiple Interrupted Time-Series Designs,which