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A randomized controlled trial assigns 300 patients to either a new medication or a placebo. Of the 150 assigned to the medication group, 30 never start due to side effects. Of the 150 assigned to the placebo group, 15 switch to the medication after 2 weeks. The researchers use an 'intention-to-treat' (ITT) analysis, keeping all 300 in their originally assigned groups. Which statement best justifies this approach?
A randomized controlled trial assigns 300 patients to either a new medication or a placebo. Of the 150 assigned to the medication group, 30 never start due to side effects. Of the 150 assigned to the placebo group, 15 switch to the medication after 2 weeks. The researchers use an 'intention-to-treat' (ITT) analysis, keeping all 300 in their originally assigned groups. Which statement best justifies this approach?