Table 1.
The definition of dietary, physical activity, sedentary, and other behaviors.
| Behaviors | Definition |
|---|---|
| Dietary | |
| Fruits (≥2 times/day) | During the past 30 days, how many times did you eat fruits every day? (0 time, <1 time, 1 time, 2 times, 3 times, 4 times, ≥5 times) |
| Vegetables (≥2 times/day) | During the past 30 days, how many times did you eat vegetables every day? (0 time, <1 time, 1 time, 2 times, 3 times, 4 times, ≥5 times) |
| Milk (≥3 day/week) | During the past 30 days, how many days did you drink milk every week? (0 day, <1 day, 1–2 days, 3–4 days, 5–7 days) |
| Soft drinks (≥1 times/day) | During the past 7 days, how many times did you drink soft drinks, such as Coke, Pepsi, or Sprite? (0 time, 1–3 times, 4–6 times, once a day, twice a day, three times a day, ≥4 times a day) |
| Fast food (≥2 day /week) | During the past 7 days, how many days did you eat fast food, such as hamburger, hotdogs, or potato chips, etc.? (0 day, 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days) |
| Physical activity | |
| Moderate physical activity (≥2 day/week) | During the past 7 days, how many days did you participate in at least 60 minutes of any kind of physical activity that increased your heart rate and made you breathe hard, such as kicking shuttlecock, fast bicycling, and doing housework, etc.? (0 day, 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days) |
| Muscle strengthening activity (≥2 day/week) | During the past 7 days, how many days did you do exercises to strengthen or tone your muscles, such as push-ups, sit-ups, or weight lifting, etc.? (0 day, 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days) |
| Attend physical education classes (≥2 day/week) | In an average week when you are in school, on how many days do you go to physical education classes? (0 day, 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days) |
| Sedentary Activity | |
| Watch TV (≥2 h/day) | On an average school day, how many hours do you watch TV? (0 h, <1 h, 1–2 h, 2–3 h, 3–4 h, 4–5 h, ≥5 h) |
| Use computer (≥2 h/day) | During the past 7 days, in an average day, on how many hours did you spend using a computer for playing games, surfing, e-mailing, or watching movies, etc.? (open question) |
| Other | |
| Sleep duration (≥8 h/day) | During the past 30 days, how many hours did you spend on sleeping every day? (open question) |
| Smoke cigarettes (yes) | During the past 30 days, on how many days did you smoke cigarettes? (0 days, 1–2 days, 3–5 days, 6–9 days, 10–19 days, 20–29 days, 30 days)”. Participants who answered they had smoked at least 1 day during the past 30 days were considered to have the cigarette-smoking behavior |
| Drink alcohol (yes) | During the past 30 days, on how many days did you have at least one drink of alcohol? (0 days, 1–2 days, 3–5 days, 6–9 days, 10–19 days, 20–29 days, 30 days)”. Participants who answered they had drunk alcohol at least 1 day during the past 30 days were considered to have the alcohol-drinking behavior |