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Table 1 Definition and coding of independent variables included in statistical analysis

From: Associations of psychological factors, parental involvement, and adverse health behaviors with bullying among tunisian middle school students

Independent variable

Question in GSHS

Binary classification

(No = 0/Yes = 1)

Physical fight

During the past 12 months, how many times were you in a physical fight?”

0 or 1 time: 0

  

More than 2 times : 1

Smoking

During the past 30 days, on how many days did you smoke cigarettes?

0 days = 0

  

At least 1 day = 1

Loneliness

During the past 12 months, how often have you felt lonely?

Never/Rarely/Sometimes = 0

  

Most of the time /Always = 1

Worries

During the past 12 months, how often have you been so worried about something that you could not sleep at night?

Never/Rarely/Sometimes = 0

  

Most of the time /Always = 1

Close friends

How many close friends do you have?

No friend: 0

  

One friend or more: 1

Missing classes

During the past 30 days, on how many days did you miss classes or school without permission?

0 days: 0

  

One day or more: 1

Parental support

During the past 30 days, how often did your parents or guardians understand your problems and worries?

Never/Rarely/Sometimes = 0

  

Most of the time /Always = 1

Parental supervision

During the past 30 days, how often did your parents or guardians check to see if your homework was done?

Never/Rarely/Sometimes = 0

  

Most of the time /Always = 1

Food insecurity

During the past 30 days, how often did you go hungry because there was not enough food in your home?

Never/Rarely/Sometimes = 0

  

Most of the time /Always = 1