Declining Outdoor Recreation and Increased Use of Fitness Centers Among Norwegian Adolescents, 2010-2019.

Although the interaction between year and population density was only marginally significant ( β = 0.02, 95% CI [−0.00, 0.05], p = 0.063), it suggests a potential trend in which the increase in fitness center training is somewhat more pronounced in more urban municipalities (see Figure 3 b).

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