very small sample sizes across included studies
Exact: 8 to 95 participants
Sample sizes in included studies ranged from just 8 to 95 participants, indicating very small study populations
Within the 15 included studies, participant numbers were very low. The smallest study had only 8 participants and the largest had 95. Such small samples are a key methodological concern flagged by the review authors, contributing to uncertainty about the neurological effects of urban environments.
Within the 15 included studies, the number of participants analyzed ranged from 8 [ 36 ] to a maximum of 95 participants [ 17 , 37 ].
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