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ED visit characteristics during the study period
| Variable | 4 charts | 2 charts | 4 charts |
|---|---|---|---|
| (November 2010 to November 2012) | (November 2012 to September 2014) | (September 2014 to August 2016) | |
| Number of visits per month (mean) | 3684 | 3736 | 4084 |
| Hospitalization, % | 25 | 26 | 27 |
| Sex (Female, %) | 58 | 57 | 57 |
| Age (mean) | 34 | 35 | 37 |
| Race/ethnicity (%) | |||
| White | 11 | 11 | 10 |
| Black | 58 | 57 | 57 |
| Asian | 2 | 2 | 2 |
| Hispanic | 11 | 8 | 8 |
| Other/unknown | 18 | 22 | 24 |
