From: Friendship networks and physical activity and sedentary behavior among youth: a systematized review
 |  | Associations with physical activity | Associations with sedentary behavior | ||||
---|---|---|---|---|---|---|---|
 |  | Positive | Null | Negative | Positive | Null | Negative |
Boys | Close friends | Â | [15] | [15] | Â | ||
 | Friendship group | [38]* |  |  |  |  |  |
 | Popularity | [15] | [45]b |  | [15] |  | |
 | Friendship selection |  |  |  |  |  |  |
Girls | Close friends | Â | [15] | [15] | Â | ||
 | Friendship group |  |  |  |  |  | |
 | Popularity | [45]b |  | [15] | [15] |  | |
 | Friendship selection |  |  |  |  |  |  |
Boys and girls | Close friends | Â | Â | Â | Â | Â | |
 | Friendship group | [44] |  |  | [14] |  | |
 | Popularity | [40] | [45] |  |  | [46] | |
 | Friendship selection | [43]b | [40]b |  |  |  |  |