Table 1.
Characteristics of Emergency Department Patients, Overall and by Study Phase
| Overall (n=236,791) |
Treatment as usual (Phase 1) (n=94,257) |
Universal screening (Phase 2) (n=57,215) |
Universal screening + intervention (Phase 3) (n=85,319) |
p- value |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Characteristics | n | % | n | % | n | % | n | % | |
| Age, in years | |||||||||
| Age, mean | 45 | 45 | 46 | 46 | |||||
| (SD) | 236,744 | (19) | 94,246 | (19) | 57,194 | (19) | 85,304 | (19) | <0.001 |
| 18–24 | 32,017 | 13.5 | 13,192 | 14.0 | 7,614 | 13.3 | 11,211 | 13.1 | <0.001 |
| 25–34 | 46,728 | 19.7 | 18,861 | 20.0 | 11,310 | 19.8 | 16,557 | 19.4 | |
| 35–44 | 40,934 | 17.3 | 16,667 | 17.7 | 9,859 | 17.2 | 14,408 | 16.9 | |
| 45–54 | 45,118 | 19.1 | 18,124 | 19.2 | 10,737 | 18.8 | 16,257 | 19.1 | |
| 55–64 | 32,133 | 13.6 | 12,047 | 12.8 | 7,813 | 13.7 | 12,273 | 14.4 | |
| 65–74 | 17,930 | 7.6 | 6,859 | 7.3 | 4,466 | 7.8 | 6,605 | 7.7 | |
| >75 | 21,884 | 9.2 | 8,496 | 9.0 | 5,395 | 9.4 | 7,993 | 9.4 | |
| ND | 47 | 0.02 | 11 | 0.01 | 21 | 0.04 | 15 | 0.02 | |
| Sex | <0.001 | ||||||||
| Female | 129,078 | 54.5 | 51,435 | 54.6 | 31,583 | 55.2 | 46,060 | 54.0 | |
| ND | 59 | 0.02 | 22 | 0.02 | 19 | 0.03 | 18 | 0.02 | |
| Race | <0.001 | ||||||||
| White | 138,098 | 58.3 | 54,305 | 57.6 | 33,672 | 58.9 | 50,121 | 58.8 | |
| Black | 51,657 | 21.8 | 21,708 | 23.0 | 12,844 | 22.5 | 17,105 | 20.1 | |
| Other | 7,577 | 3.2 | 2,804 | 3.0 | 2,126 | 3.7 | 2,647 | 3.1 | |
| ND | 39,459 | 16.7 | 15,440 | 16.4 | 8,573 | 15.0 | 15,446 | 18.1 | |
| Ethnicity | <0.001 | ||||||||
| Hispanic | 36,264 | 15.3 | 14,535 | 15.4 | 8,727 | 15.3 | 13,002 | 15.2 | |
| Non-Hispanic | 91,387 | 38.6 | 29,697 | 31.5 | 21,166 | 37.0 | 40,524 | 47.5 | |
| ND | 109,140 | 46.1 | 50,025 | 53.1 | 27,322 | 47.8 | 31,793 | 37.3 | |
| Day of week | <0.001 | ||||||||
| Sunday | 7,934 | 3.4 | 2,842 | 3.0 | 1,871 | 3.3 | 3,221 | 3.8 | |
| Monday | 46,093 | 19.5 | 16,935 | 18.0 | 11,093 | 19.4 | 18,065 | 21.2 | |
| Wednesday | 46,910 | 19.8 | 19,019 | 20.2 | 11,218 | 19.6 | 16,673 | 19.5 | |
| Thursday | 44,327 | 18.7 | 17,916 | 19.0 | 11,674 | 20.4 | 14,737 | 17.3 | |
| Friday | 30,502 | 12.9 | 13,494 | 14.3 | 6,950 | 12.2 | 10,058 | 11.8 | |
| Saturday | 11,737 | 5.0 | 4,545 | 4.8 | 2,255 | 3.9 | 4,937 | 5.8 | |
| Site | <0.001 | ||||||||
| 1 | 42,027 | 17.8 | 15,950 | 16.9 | 8,079 | 14.1 | 17,998 | 21.1 | |
| 2 | 19,140 | 8.1 | 6,798 | 7.2 | 4,801 | 8.4 | 7,541 | 8.8 | |
| 3 | 31,378 | 13.3 | 9,934 | 10.5 | 8,873 | 15.5 | 12,571 | 14.7 | |
| 4 | 22,306 | 9.4 | 14,870 | 15.8 | 2,867 | 5.0 | 4,569 | 5.4 | |
| 5 | 39,872 | 16.8 | 15,174 | 16.1 | 11,065 | 19.3 | 13,633 | 16.0 | |
| 6 | 28,675 | 12.1 | 10,786 | 11.4 | 7,868 | 13.8 | 10,021 | 11.8 | |
| 7 | 28,120 | 11.9 | 12,679 | 13.5 | 8,507 | 14.9 | 6,934 | 8.1 | |
| 8 | 25,273 | 10.7 | 8,066 | 8.6 | 5,155 | 9.0 | 12,052 | 14.1 | |
ND, not documented
Note: Boldface indicates statistical significance (p<0.05).