Table 4 Descriptive statistics and bivariate correlations of study variables (N = 1875)

1. Depressive symptoms at T0

2.39 ± 2.64

1.00

2. Depressive symptoms at T1

2.86 ± 3.32

0.91^***

1.00

3. Depressive symptoms at T2

3.20 ± 3.69

0.85^***

0.96^***

1.00

4. Depressive symptoms at T3

3.87 ± 4.49

0.74^***

0.84^***

0.92^***

1.00

5. Physical activity at T0

153.12 ± 87.13

− 0.10^***

− 0.09^***

− 0.11^***

− 0.11^***

1.00

6. Physical activity at T1

149.36 ± 85.65

− 0.11^***

− 0.14^***

− 0.16^***

− 0.17^***

0.97^***

1.00

7. Physical activity at T2

146.50 ± 84.56

− 0.12^***

− 0.16^***

− 0.19^***

−0.20^***

0.94^***

0.98^***

1.00

8. Physical activity at T3

145.52 ± 85.01

−0.12^***

−0.15^***

− 0.18^***

−0.21^***

0.93^***

0.97^***

0.99^***

1.00