Associations of Physical Activity and Sedentary Behaviors with Dietary Behaviors among US High School Students

Table 1

Question wording and analytic coding for dietary variables—National Youth Physical Activity and Nutrition Study, 2010.

Dietary behaviors	Questionnaire item(s)	Analytic coding
Fruits	Combination of two items: (1) During the past 7 days, how many times did you eat fruit? (Do not count fruit juice); (2) During the past 7 days, how many times did you drink 100% fruit juices such as orange juice, apple juice, or grape juice? (Do not count punch, Kool-Aid, sports drinks, or other fruit-flavored drinks)	For combined variable: ≥2 times/day versus; <2 times/day (referent)
Vegetables	Combination of four items: (1) During the past 7 days, how many times did you eat green salad?; (2) During the past 7 days, how many times did you eat potatoes? (Do not count French fries, fried potatoes, or potato chips); (3) During the past 7 days, how many times did you eat carrots?; (4) During the past 7 days, how many times did you eat other vegetables? (Do not count green salad, potatoes, or carrots)	For combined variable: ≥3 times/day versus; <3 times/day (referent)
Fast food	During the past 7 days, on how many days did you eat at least one meal or snack from a fast food restaurant such as McDonald’s, Taco Bell, or KFC?	≥1 day/week versus; 0 days/week (referent)
Sugar-sweetened beverages	Combination of four: (1) During the past 7 days, how many times did you drink a can, bottle, or glass of soda or pop, such as Coke, Pepsi, or Sprite? (Do not count diet soda or diet pop); (2) During the past 7 days, how many times did you drink a can, bottle, or glass of a sports drink such as Gatorade or PowerAde? (Do not count low-calorie sports drink such as Propel or G2); (3) During the past 7 days, how many times did you drink a can, bottle, or glass of an energy drink such as Red Bull or Jolt? (Do not count diet energy drinks or sports drinks such as Gatorade or PowerAde); (4) During the past 7 days, how many times did you drink a can, bottle, or glass of a sugar-sweetened beverage such as lemonade, sweetened tea or coffee drinks, flavored milk, Snapple, or Sunny Delight? (Do not count soda or pop, sports drinks, energy drinks, or 100% fruit juice)	For combined variable: ≥3 times/day versus; <3 times/day (referent)