Sex
Grade
Grade point average
Using internet everyday
Time spend on using internet (hour/day)
Private room
Living room alone
Living room with others
Public places
In the classroom
Outside the classroom
Others
Mobile phone
Tablet
Public computer
Private computer
Access social networks
Talk with other people
Send email
Search for information
Read news
Study
Listen to music
Watch movies
Shopping
Play game
Post photos
Feel safe in my school
The teachers at this school treat students fairly
Be happy to be at this school
Feel like I am part of this school
Feel close to people at this school
Often experience fight, quarrel in the neighborhood
Often experience crime in neighborhood
Economical classification of living location
Living location
Caring from father
Control from father
Caring from mother
Control from mother
Bullying in the neighbour
Cyber victimization
Number of forms being vyber-victimized
Symptoms of depression
Class
Sampling weight
Living with whom
Internet addiction
Experience violence from peers in the neighborhood
School connectedness score