Table 4 Multivariate model for having moderate/severe anxiety among adolescents

Average online time per day (ref: less than 4 h)

  4 to 6 h

1.33*

0.03

[1.04, 1.70]

  6 to 8 h

1.76**

0.00

[1.46, 2.12]

  8 h or more

2.28**

0.00

[1.89, 2.74]

Internet addiction (ref: no indicator)

  One indicator

1.00

0.97

[0.79, 1.26]

  Two indicators

1.17

0.19

[0.92, 1.48]

  Three indicators

1.31*

0.04

[1.01, 1.69]

  Four or more indicators

1.44*

0.01

[1.09, 1.91]

Age (14–17 years old vs. 11–13 years old)

1.09

0.29

[0.93, 1.28]

Sex (Female vs. Male)

1.78**

0.00

[1.56, 2.03]

Urban vs. Rural

0.99

0.89

[0.87, 1.12]

Living with (Ref: with both parents)

  Single parent

1.17

0.16

[0.94, 1.47]

  No one

2.26

0.10

[0.87, 5.88]

Ever experienced your family having difficulty in buying food (Yes vs. No)

1.45**

0.00

[1.26, 1.67]

Experience family domestic violence during COVID time (Yes vs. No)

2.89**

0.00

[2.40, 3.47]

Have at least one of your parents unemployment due to COVID (Yes vs. No)

1.10

0.21

[0.95, 1.27]

Intercept

0.12**

0.00

[0.09, 0.16]