The most likely source of confounding in the interrupted time-series design is:
A) Attrition
B) Regression artifact
C) Differential selection
D) History

Question

Quizplus · Accepted Answer

In an interrupted time-series design, history is a common source of confounding because external events occurring at the same time as the intervention can affect the outcome, making it difficult to attribute changes solely to the intervention.

The Most Likely Source of Confounding in the Interrupted Time-Series