Table 1 Question-wording, response options and coding.
From: Secondhand smoke exposure among never-smoking adolescents in Wuhan, China
Variables | Survey items | Original response options | Dichotomized measure |
|---|---|---|---|
Item used to obtain never-smoking adolescents | |||
Smoking status | Have you ever tried or experimented with cigarette smoking, even one or two puffs? | No; Yes | No = never smoker;Yes = ever smoker |
Dependent variable | |||
Exposure to SHS at home | During the past seven days, how many days did someone smoke tobacco products in your home while you were there? | 0 day; 1–2 days; 3–5 days; 6–9 days; 7 days | No = 0 day; Yes = ≥ 1 days |
Exposure to SHS in public places | During the past seven days, how many days did you smell the smoke from someone smoking tobacco products in an indoor or outdoor public place? During the past seven days, how many days did you ride in a vehicle when someone was smoking a tobacco product? | 0 day; 1–2 days; 3–5 days; 6–9 days; 7 days | No = 0 days for both items; Yes = ≥ 1 days for either item |
Exposure to SHS in school | During the past 30 days, have you noticed anyone smoking inside or outside the school building? | No; Yes | No = No; Yes = Yes |
Independent variables | |||
Knowledge about the harm of SHS | Do you think the smoke from other people's cigarettes harms you? | Definitely not; Probably not; Probably yes; Definitely yes | No = definitely not; Yes = any other responses |
Peer smoking | Do any of your closest friends smoke cigarettes? | None of them; Some of them; Most of them; All of them | No = none of them; Yes = any other response |
Parental smoking | Do your parents smoke? | None; Both; Father only; Mother only; I don't know* | No = None or I don't know; Yes = Both or Father only or Mother only; . = I don't know |
Exposed to antismoking media messages | During the past 30 days, have you seen anti-smoking media messages (e.g., television, radio, Internet, billboards, poster, etc.)? | No; Yes | No = No; Yes = Yes |
Observing teachers smoking in school | How often do you usually see teachers smoking inside or outside the school buildings during school hours? | Almost every day; Sometimes; Never; I do not know* | No = Never or I do not know; Yes = Almost every day or sometimes; . = I don't know |
Disposable income (CNY) | Within a week, on average, how much disposable income do you have? | None; Less than 10; 11 to 20; 21 to 30; 31 to 40; 41 to 50; More than 50 | None; Less than 20; 21 to 50; More than 50; |
Exposed to tobacco advertising and promotion | During the past 30 days, when you go to tobacco retail outlets (such as kiosks or supermarkets), have you seen ads or promotions for cigarettes or other tobacco products? During the past 30 days, when you are using the Internet, have you seen ads or videos for cigarettes or other tobacco products? | No; Yes | No = no for both items; Yes = any other response |
