Patient characteristics: N = 85.
| CHARACTERISTICS | VALUE |
|---|---|
| Mean (SD) age, y | 33.8 (5.2) |
| Age group, n (%) | |
| • 20–24 y | 3 (3.5) |
| • 25–29 y | 12 (14.1) |
| • 30–34 y | 35 (41.2) |
| • 35–39 y | 24 (28.2) |
| • ≥ 40 y | 11 (12.9) |
| Mean (SD) gestational age, wk | 9.5 (2.7) |
| Mean (SD) serum β-hCG, IU/L | 43 882 (45 891) |
| Timing of radiologist-interpreted US after ED visit, n (%) | |
| • ≤ 24 h | 63 (74.1) |
| • 24–48 h | 10 (11.8) |
| • > 48–72 h | 6 (7.1) |
| • Did not have radiologist-interpreted US | 6 (7.1) |
ED—emergency department, hCG—human chorionic gonadotropin, US—ultrasound.