TABLE 1

Characteristics of the Study Population (With 95% Confidence Intervals)

Historical, n = 809Passive, n = 588Active, n = 489
Age, y (median)121212
Gender, % male48.2% (44.8–51.7)43.5% (39.5–47.5)46.6% (42.2–51.1)
Race, % white78.1% (75.3–81.0)76.6% (73.1–79.9)77.9% (74.2–81.6)
Resident involved, % yes29.5% (26.4–32.7)70.6% (66.9–74.3)77.5% (73.8–81.2)
Referral, % yes15.6% (13.1–18.1)56.8% (52.8–60.8)58.7% (54.3–63.1)
PAS distribution
 Low risk18.9% (16.2–21.6)10.4% (7.9–12.8)6.8% (4.5–9.0)
 Moderate risk38.8% (35.5–42.2)51.9% (47.8–55.9)60.5% (56.2–64.9)
 High risk42.3% (38.9–45.7)37.8% (33.8–41.7)32.7% (28.6–36.9)
Time of day of arrival
 Day42.4% (39.0–45.8)60.4% (56.4–64.3)58.5% (54.1–62.9)
 Evening41.9% (38.5–45.3)34.9% (31.0–38.7)34.4% (30.1–38.6)
 Overnight15.7% (13.2–18.2)4.8% (3.0–6.5)7.2% (4.9–9.4)
% of time CDS tool usedn/an/a61.6% (57.2–65.9)
% with CBC62.8% (59.5–66.1)71.9%(68.3–75.6)76.9% (73.2–80.1)
Negative appendectomy ratea17.2% (10.7–23.7)8.6% (4.6–12.6)16.8% (12.9–20.7)
Missed appendicitis ratebn/a00
  • n/a, not applicable.

  • a Based on operative histology.

  • b Based on 1-mo follow-up.