Table 1. Operational definitions.
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Each season, a player must register with the NCYSA. Each coach/team manager received a detailed description of the project that outlined their responsibilities plus a set of injury reporting cards. Each week during the Classic season, the coach/team manager was to return a card stating which player had been injured that week, what body part was injured, whether the injury occurred during practice or a game, and the player’s home phone number. A card was to be returned even if no injuries had occurred. This card was to accompany the game report that was returned to the NCYSA each week.