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Table 1 Questions and variable settings in the survey questionnaire

From: Factors influencing smoking behaviour of online ride-hailing drivers in China: a cross-sectional analysis

Dimension Variables Assignment
Smoking status Have you smoked in the past 30 days? Yes = 1; No = 0
Have you smoked in the car? Yes = 1; No = 0
Do you permit passengers to smoke in the car? Yes = 1; No = 0
Sociodemographic characteristics Area of residence* Eastern regions = 1; Central regions = 2; Western regions = 3
Gender Male = 1; Female = 2
Age 18–34 years = 1; 35–44 years = 2; ≥45 years = 3
Marital status Married = 1; Unmarried = 2; Divorced/Widowed/Remarried/Others = 3
Educational level Junior high school and below = 1; Vocational/Technical secondary school/High school = 2; Junior college and above = 3
The ratio of family burden† Less than the gross dependency coefficient‡ = 1;
Equal or more than the gross dependency coefficient = 2
Job characteristics Working years as a full-time driver < 5 years = 1; 5–10 years = 2; ≥10 years = 3
Working hours per day < 10 h = 1; 10–12 h = 2; ≥12 h = 3
Period of work Daytime = 1; Night = 2; Both daytime and night = 3; Non-fixed working time = 4
Time spent per day outside the car to relax during work < 5 min = 1; 5–10 min = 2; ≥10 min = 3
Health-related factors Health status
Experiences of chronic illness§ Yes = 1; No = 0
Self-reported health Good = 1; General = 2; Poor = 3
Feelings of anxiety Never = 1; Occasionally = 2; Frequently = 3
Weight status¶ Underweight = 1; Normal = 2; Overweight = 3
Health behaviour
Drinking status Current drinker = 1; Nondrinker = 0
Eating habits Extremely regular = 1; Regular in general = 2; Extremely irregular = 3
Choice of place to eat Mainly eating at home = 1; Mainly eating out = 2
Sleep duration per day < 6 h = 1; 6–8 h = 2; ≥8 h = 3
The number of days in a week of engaging in at least 10 min of moderate or vigorous exercise 0 day = 1; 1–2 days = 2; ≥3 days = 3
Health literacy
Level of the initiative to acquire health knowledge Never = 1; Occasionally = 2; Frequently = 3
Main approaches for acquiring health knowledge Mobile phone; Television shows; Broadcast; Internet; Doctors; Newspapers; Families/Colleagues/Friends; Brochure or bulletin board; Others
  1. *Following the classification standards commonly used in national statistics, the eastern, central and regional areas include 11, 8 and 12 provincial administrative regions, respectively [46]
  2. †The original questions were ‘the number of families’ and ‘the number of children and the elderly in the family’. We converted them into the indicator ‘the ratio of family burden’ following the formula ‘the ratio of family burden = (the number of people aged 14 and under + the number of people aged 65 and over)/ the number of people aged 15–64 × 100%’
  3. ‡On the basis of the number of Chinese people of all ages at the end of 2017, the gross dependency coefficient was 41.19%
  4. §The chronic illness was not self-reported but medically diagnosed
  5. ¶Weight status was classified using body mass index (BMI): BMI between 18.5 and 23.9 kg/m2 was considered normal weight, less than 18.5 kg/m2 was underweight and higher than 23.9 kg/m2 was overweight