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Researchers randomly split participants into "above average" quality sleep and "below average" quality sleep groups.
Figure 3 illustrates the group-specific linear growth trajectories of the two groups (classification via median split): participants below the median (0 3 years of vocational experience; n = 10) show a stronger increase in HR, with increasing values of goal elaboration and definition, than participants above the median (≥4 years of vocational experience; n = 8).
It has been shown via the minimal group studies that ingroup favoritism may occur for both arbitrary ingroups (e.g. a coin toss may split participants into a 'heads' group and a 'tails' group) as well as non-arbitrary ingroups (e.g. ingroups based on cultures, genders, sexual orientation, and first languages).
We thus split participants based on meeting these recommended guidelines (less than 33 minutes = 0, equal or greater than 33 minutes = 1), labeled here, for brevity, as "sedentary" vs. "active".
Daily reports of physical activity were extremely skewed (range 0 to 300 minutes, 30 participants reported no exercise), and therefore we split participants based on previously reported required amounts of physical activity for good health.
The intuition is that most randomised trials recruit individuals and then split participants into different treatment arms.
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This was achieved by splitting participants into three approximately equal groups (a 24/23/23 split) with each group performing the same tests but with a different mapping of sound conditions to tests.
Conjunction-task cost was calculated by subtracting the conjunction Aprime scores from the average of both single task scores; high/low groups were identified by computing the median conjunction-task cost value and forming a median split between participants, yielding nine participants in each group.
We also decided to split the participants by age (20 39 years and 40 65 years) to overcome the shyness of the younger participants.
Another solution is to split exercise participants into two or more groups that allow everyone to participate, often placing people at similar levels of responsibility in the same group, and to conclude the exercise with a session that brings everyone together to share what they learned.
To reduce this problem, we opted to split eligible participants into three groups based on SOD (good, moderate, and poor) and to include only good and poor SOD participants in our main experiment.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com