Table 2 Results from Mixed-Effects Models without Interaction Effects (Model 4)

(Intercept)

0.35

0.17–0.53

< 0.001

0.35

0.16–0.53

< 0.001

0.69

0.48–0.89

< 0.001

Fixed Effects

 W1 Depressive Symptoms

0.24

0.15–0.33

< 0.001

0.55

0.46–0.65

< 0.001

0.29

0.19–0.39

< 0.001

 Siblings (ref = has sibs.)

−0.09

−0.25–0.07

0.284

−0.06

−0.23–0.10

0.449

−0.09

−0.28–0.09

0.327

 Parents cohabiting (ref = cohabit.)

−0.01

−0.09–0.07

0.750

0.03

−0.06–0.11

0.546

0.08

−0.01–0.17

0.080

 Age at baseline

0.02

−0.00–0.04

0.065

0.01

−0.01–0.04

0.202

−0.03

−0.05 – −0.00

0.035

 Sex (ref = male)

−0.26

−0.33 – −0.19

< 0.001

−0.22

−0.30 – −0.15

< 0.001

−0.07

−0.15–0.01

0.091

 Occasion 1 (1st lockdown)

−0.06

−0.13–0.02

0.139

0.04

−0.04–0.12

0.284

0.05

−0.03–0.12

0.252

 Occasion 2 (2nd lockdown)

0.05

−0.02–0.13

0.152

0.04

−0.03–0.12

0.267

0.03

−0.05–0.10

0.487

 Occasion 3 (reopening)

0.09

0.02–0.16

0.017

0.14

0.06–0.22

< 0.001

0.06

−0.02–0.13

0.128

Random Effects

 σ²

0.08

0.09

0.07

 τ_participants

0.06

0.06

0.07

 τ_family

0.02

0.02

0.03

 ICC

0.50

0.48

0.60

 N_participants

369

372

354

 N_family

304

307

294

Observations

764

771

707

Marginal R² / Conditional R²

0.198 / 0.602

0.323 / 0.648

0.098 / 0.640