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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