Table 1.

Caffeine categories in study of United States Navy and Marine Corps personnel.

Category	Definition
Any caffeine	All caffeine-containing beverages, gums, and medications as listed below
Coffee	Hot or cold brewed coffee, espresso, cappuccino, frozen blended coffee drinks, and other coffee-based beverages that contain caffeine
Hot tea *	Hot brewed tea of any type that contains caffeine
Other tea *	Other teas including iced tea and cold tea blends that include caffeine
Cola †	All brands of cola-type beverages that contain caffeine
Other soda †	Sodas that are not colas but are carbonated and contain caffeine including root beers, orange soda, and other flavored sodas
Energy drink	All beverages labeled as energy drinks of any kind that contain caffeine
Gum or medication	Chewing gums, prescription medications, weight control aids, and other over-the-counter medications that contain caffeine
Other drink	Flavored waters, hot chocolate, chocolate milks, and derivatives that contain caffeine

* Hot tea and other tea were combined for some analyses. ^† Cola and other soda were combined for some analyses.