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Table S1: Steps and criteria for matching control horses to the 65 Thoroughbred (TB) and 26 Quarter Horse (QH) case horses. The number (No.) in parentheses indicates the number of control horses that were of the same sex (i.e. males), but differed due to castration status (i.e. intact or neutered male) of their respective case horses.

Table S2: Comparison of exercise histories between Thoroughbred racehorses that died because of a scapular fracture that occurred during racing vs. during training. Note that horses with a lay-up could have had unrecorded workouts or exercise.

Table S3: Comparison of exercise history variables between Quarter Horse racehorses that died because of a scapular fracture that occurred during racing vs. during training. Note that horses with a lay-up could have had unrecorded workouts or exercise.

Table S4: Univariable comparison of exercise histories of the 15 Thoroughbred cases (horses with a scapular fracture) that had undergone >10 events since their last lay-up (≥60 days without an event) or since the beginning of training (i.e. if they had never had a lay-up) vs. their respective Thoroughbred controls (matched completely on breed, date of death, event, and racetrack; and incompletely on age and sex) for racehorses that had complete exercise histories.

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