UNCSAUniversity of North Carolina School of the Arts (Winston-Salem, NC)
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Incident injuries were identified through a detailed review of the UNCSA Student Health Services (SHS) EHR system.
The start date of an injury was defined as the first day a dancer was seen at the UNCSA SHS for initial care of that injury.
Person-days of enrollment at UNCSA were calculated based on the length of academic terms at UNCSA.
(44-47) For our study, data on potential predictors of injury were obtained from two sources: a pre-matriculation student health questionnaire and anthropometric assessments conducted by the UNCSA SHS at time of matriculation.
Measurements to calculate BMI and BF% were collected by UNCSA SHS staff when each dancer enrolled at UNCSA.
All remaining measures were derived from self-reported information provided by the students using a standardized health questionnaire prior to enrollment at UNCSA. The questionnaire was used by UNCSA SHS for administrative purposes and included measures of mental health history, risk-taking behavior, and injury history.
To account for possible variations in injury rate by time, two variables were parameterized as time-varying covariates: age and history of injury while at UNCSA. Age was defined as age at the beginning of the semester.
For the time-varying covariates of age and history of injury at UNCSA, variables were parameterized both as continuous and categorical variables in all steps to determine which was the best fit for the models.
There were 480 dancers at UNCSA who began enrollment during or after Fall 2009 and were followed up through either the end of their studies at UNCSA or Spring 2015.
The maximum number of injuries sustained by a UNCSA dancer was 15 (this dancer was followed for 2.6 years in our study).
Additionally, neither of the time-varying covariates (i.e., age, history of injury at UNCSA) were predictors of injury rate.
Using multivariable modeling, we found that the best predictive model (based on the low QICu score) for females was a self-reported history of depression, age at time of injury, number of injuries sustained at UNCSA prior to the current semester, BMI, dance style, and history of back pain.