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Table 2 Descriptive statistics of physical activity, screen time, and depressive symptoms

From: Physical activity, recreational screen time, and depressive symptoms among Chinese children and adolescents: a three-wave cross-lagged study during the COVID-19 pandemic

 

T1

T2

T3

Descriptive statistics

n

Descriptive statistics

n

Descriptive statistics

n

Physical activity

      

 Daily MVPA minutes, mean (SD)

79.1 (85.7)

1666

25.7 (64.6)

1665*

60.9 (78.9)

1665*

 Daily MVPA ≥ 1 h, n (%)

769 (46.2%)

192 (11.5%)

583 (34.0%)

 Daily MVPA < 1 h, n (%)

897 (53.8%)

1473 (88.5%)

1082 (65.0%)

Screen time

      

 Daily RST minutes, mean (SD)

43.3 (64.0)

1666

111.3 (136.0)

1666

63.4 (85.1)

1665*

 Daily RST ≤ 2 h, n (%)

1534 (92.1%)

1144 (68.7%)

1416 (85.0%)

 Daily RST > 2 h, n (%)

132 (7.9%)

522 (31.3%)

249 (15.0%)

Depressive symptoms

      

 Total CDI-S scores, mean (SD)

4.05 (2.67)

1666

3.80 (2.47)

1666

3.95 (2.72)

1665*

 CDI-S scores < 7, n (%)

1429 (85.8%)

1457 (87.5%)

1424 (85.5%)

 CDI-S scores ≥ 7, n (%)

237 (14.2%)

209 (12.5%)

242 (14.5%)

  1. Abbreviation: MVPA: Moderate-to-vigorous intensity physical activity; RST: Recreational screen time; CDI-S: Children Depression Inventory-Short Form; SD: Standard deviation; T1: Time point 1; T2: Time point 2; T3: Time point 3
  2. *there is 1 missing value for physical activity at T2, and 1 each for physical activity, screen time, and depressive symptoms at T3