Anxiety, Sleep Problems, and Vigorous Physical Activity: Bidirectional Associations from Early Adolescence to Early Adulthood in Swedish Adolescents.

All the autoregressive paths were significant, except for the autoregressive stability path for sleep from T1 to T2 that was only marginally significant (Beta = 0.12, SE = 0.07, p < 0.10) (see Table 2 and Fig. 2 ), indicating that deviations from the individual average score in a factor were always related to an unexpected change in the same factor at the following timepoint.

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Nevertheless, a greater than expected increase of vigorous physical activity at T3 predicted a greater than expected decrease in sleep problems at T4 (Beta = −0.10, SE = 0.05, p < 0.05), and a slightly significant, greater than expected decrease in anxiety symptoms at T4 (Beta = −0.08, SE = 0.05, p < 0.10).

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