Table 1 Variables included in the study and their coding for analysis

Variable ID: CR3 BDR15 NPR12

During the past 30 days, on how many days did you smoke cigarettes/bidis? Options included: 1 = 0 days, 2 = 1 or 2 days, 3 = 3 to 5 days, 4 = 6 to 9 days, 5 = 10 to 19 days, 6 = 20 to 29 days, 7 = All 30 days

0 = Not using cigarettes (option 1) 1 = Any use (option 2 to 7)

Variable ID: NPR17 CR8

During the past 30 days, did you use any form of smoked tobacco products other than cigarettes and bidis such as cigars, water pipe (hukkah), cigarillos, little cigars, pipe etc.? Options included: 1 = yes, 2 = no

0 = Not using other smoked tobacco products (option 2) 1 = Any use (option 1)

Variable ID: BDR23 NPR20

(A) During the past 30 days, on how many days did you use smokeless tobacco (chewing or applying or snuff) such as surti, khaini, panmasala, gutka, parag, gul etc.? Options included: 1 = 0 days, 2 = 1 or 2 days, 3 = 3 to 5 days, 4 = 6 to 9 days, 5 = 10 to 19 days, 6 = 20 to 29 days, 7 = All 30 days

0 = Not using any smokeless products (option 1) 1 = Any use (option 2 to 7)

Variable ID: CR9

(B) During the past 30 days, did you use any form of smokeless tobacco products (e.g. chewing tobacco, snuff, dip)? Options included: 1 = yes, 2 = no

0 = Not using any smokeless tobacco products (option 2) 1 = Any use (option 1)

Variable Name

Question asked in the survey

Coding for analysis

Age in years CR52

How old are you? Options included: 11 to 17 years

1 = youths (13 to 15 years of age); 0 = others

Gender: CR53

What is your sex?

1 = male, 2 = female

Education gradeBDR73, NPR75, LKR54

In what grade are you?

Seventh, Eighth, Ninth, Tenth

Parental tobacco use CR12, BDR25, BDR26

Do your parents smoke cigarettes/bidis or use smokeless tobacco? 1 = none, 2 = both, 3 = father only, 4 = mother only, 5 = I don’t know

0 = no (option 1 & 5) 1 = yes (option 2 to 4)

Friends tobacco use CR25

Do any of your closest friends smoke? 1 = none of them, 2 = some of them, 3 = most of them, 4 = all of them

0 = no (option 1) 1 = yes (option 2 to 4)

Smoking at home CR30

During the past 7 days, on how many days have people smoked in your home, in your presence? Options included:

0 = no (option 1) 1 = 1-4 days (option 2 & 3) 3 = 5-7 days (option 4 & 5)

Smoking at other places than home CR31

During the past 7 days, on how many days have people smoked in your presence, in places other than in your home? 1 = 0, 2 = 1 to 2, 3 = 3 to 4, 4 = 5 to 6, 5 = 7 days

0 = no (option 1) 1 = 1-4 days (option 2 & 3) 3 = 5-7 days (option 4 & 5)

Offer free tobacco products by sales men: CR47

Has a cigarette company representative ever offered you a free cigarette? Options included: 1 = yes, 2 = no

0 = no (option 2) 1 = yes (option 1)

Advertisement seen in hoarding, bus-stop, station CR44

During the past 30 days, how many advertisements for cigarettes have you seen on hoardings, buses, bus-stops, trains, railway platforms, shops or as writings on walls? Options included: 1 = a lot, 2 = a few, 3 = none

0 = none (option 3) 1 = a few (option 2) 2 = a lot (option 1)

Taught in class about danger of smoking: CR48

During this school year, were you taught in any of your classes about the dangers of smoking? Options included: 1 = yes, 2 = no, 3 = not sure

0 = no (option 2 and 3) 1 = yes (option 1)

Discussed smoking and health as part of a lesson BDR70, CR51

How long ago did last discuss smoking and health as part of a lesson? 1 = never, 2 = this year/term, 3 = last year/term, 4 = 2 years/terms ago, 5 = 3 years/terms ago, 6 = more than 3 years/terms ago

0 = never (option 1) 1 = during this survey year (option 2); 2 = before year of survey (option 3 to 6)