Table 3.

Range and median of each variable for each sampling method compared to the overall ED population.

Characteristic	Median %, Min-Max% by Sampling Method
	Percent in Population	True Random	Random 4-Hour Time Block by pre-set number of blocks	Random 4-Hour Time Block with set sample size	Business Hour
	N=21,662	n = 200	n ≈ 200	n = 200	n = 200
Age
12 & under	6	7, 2–12	6, 0.5–13	6, 1–14	5, 0.5–10
13–19	7	7, 2–14	7, 2–13	7, 2–13	6, 1–12
20–49	59	59, 49–68	59, 48–70	59, 49–71	59, 47–70
50–69	21	21, 12–29	20, 10–30	21, 12–31	23, 13–32
70 & older	7	8, 2–14	7, 1–16	8, 2–14	8, 2–16
Sex (male)	43	43, 32–53	43, 33–54	43, 32–54	43, 33–53
Race
Black	25	25, 15–35	24, 15–35	25, 16–35	24, 14–36
Caucasian	49	49, 38–60	49, 34–64	49, 37–61	51, 39–61
Hispanic	21	21, 11–30	21, 11–32	21, 12–34	20, 10–28
Other	5	6, 1–11	5, 0.5–18	6, 1–20	6, 1–11
Language
English	90	90, 83–98	90, 81–97	90, 82–97	91, 84–96
Spanish	8	8, 1–15	8, 2–15	8, 2–16	7, 2–13
Other	2	2, 0–5	2, 0–7	2, 1–8	2, 0–7
Triage acuity
Emergent	15	15, 7–25	15, 7–25	15, 8–26	14, 6–21
Urgent	51	51, 40–62	51, 38–65	51, 37–66	51, 40–61
Non-urgent	34	35, 24–46	34, 20–47	35, 22–50	35, 25–45
Disposition
Admitted	16	17, 9–26	16, 8–25	17, 9–27	17, 8–26
Discharged	71	71, 60–80	71, 52–85	71, 54–82	72, 62–82
Left before complete visit	13	13, 5–20	12, 3–29	12, 4–29	11, 5–21
Mode of arrival
Ambulatory	87	87, 78–95	87, 75–96	87, 77–95	88, 81–97
Payer source
Self-pay	43	44, 30–56	43, 30–57	43, 31–57	43, 30–56
Private insurance	20	20, 12–29	20, 10–30	20, 10–30	19, 11–27
Public insurance	24	24, 14–35	24, 12–36	24, 14–35	25, 15–35
Medicare	13	13, 7–22	13, 4–23	13, 5–21	14, 6–23