Analysis of the Adequacy of Prehospital Emergency Medical Services Use of Patients Who Visited Emergency Departments in Korea from 2016 to 2018: Data from the National Emergency Department Information System

Table 3

Arrival time and month of patients, n (%).

	Appropriate EMS usage	Appropriate no EMS usage	Underuse	Overuse
	KTAS (1, 2, 3) and ambulance	KTAS (4, 5) and no ambulance	KTAS (1, 2, 3) and no ambulance	KTAS (4, 5) and ambulance
	2,408,875 (13.16)	9,259,706 (50.6)	5,147,352 (28.13)	1,482,602 (8.10)
Arrival time
00	80,374 (11.20)	381,268 (26.35)	189,027 (53.15)	66,700 (9.30)
01	68,186 (12.07)	286,967 (26.93)	152,173 (50.78)	57,808 (10.23)
02	59,473 (12.70)	231,271 (27.40)	128,258 (49.40)	49,127 (10.49)
03	53,299 (13.26)	194,297 (27.98)	112,476 (48.34)	41,878 (10.42)
04	50,033 (14.07)	166,685 (29.00)	103,089 (46.89)	35,686 (10.04)
05	51,173 (15.16)	153,390 (29.57)	99,840 (45.43)	33,203 (9.83)
06	59,713 (16.05)	165,505 (30.34)	112,889 (44.48)	33,967 (9.13)
07	75,215 (16.82)	198,421 (29.86)	133,503 (44.38)	39,959 (8.94)
08	96,110 (17.73)	239,457 (28.59)	154,965 (44.18)	51,478 (9.50)
09	122,525 (16.48)	334,872 (29.48)	219,206 (45.13)	67,009 (9.01)
10	139,688 (15.90)	395,380 (30.78)	270,499 (44.99)	73,203 (8.33)
11	140,992 (15.92)	396,309 (31.34)	277,505 (44.76)	70,549 (7.97)
12	133,956 (16.43)	361,569 (31.07)	253,287 (44.37)	66,239 (8.13)
13	128,867 (16.05)	372,004 (29.17)	234,244 (46.32)	67,917 (8.46)
14	127,844 (15.20)	397,808 (29.08)	244,551 (47.31)	70,684 (8.41)
15	126,603 (14.91)	405,753 (28.98)	246,103 (47.77)	70,849 (8.34)
16	123,608 (14.16)	424,905 (29.04)	253,483 (48.68)	70,825 (8.11)
17	119,946 (12.94)	475,518 (28.29)	262,252 (51.29)	69,363 (7.48)
18	119,786 (12.04)	536,107 (26.74)	266,164 (53.87)	73,192 (7.35)
19	120,495 (10.45)	652,310 (26.26)	302,800 (56.58)	77,368 (6.71)
20	112,768 (9.38)	700,156 (26.24)	315,511 (58.23)	74,022 (6.16)
21	106,409 (9.07)	685,711 (26.14)	306,518 (58.47)	74,047 (6.31)
22	100,550 (9.46)	611,312 (25.92)	275,415 (57.53)	75,309 (7.09)
23	91,262 (10.26)	492,641 (26.25)	233,594 (55.37)	72,220 (8.12)
Arrival day
Monday	372,094 (14.55)	1,214,418 (29.59)	756,618 (47.49)	213,997 (8.37)
Tuesday	342,115 (14.76)	1,098,608 (29.05)	673,070 (47.41)	203,334 (8.78)
Wednesday	339,208 (15.01)	1,062,558 (29.02)	655,829 (47.02)	201,974 (8.94)
Thursday	341,922 (15.29)	1,041,140 (29.06)	649,958 (46.54)	203,832 (9.11)
Friday	349,901 (15.22)	1,075,839 (28.72)	660,187 (46.81)	212,625 (9.25)
Saturday	337,521 (11.48)	1,589,544 (26.72)	785,462 (54.08)	226,931 (7.72)
Sunday	326,114 (8.84)	2,177,599 (26.19)	966,228 (59.02)	219,909 (5.96)
Arrival month
1	194,566 (13.41)	727,086 (28.86)	418,615 (50.12)	110,287 (7.60)
2	173,628 (12.85)	697,128 (27.95)	377,610 (51.59)	102,832 (7.61)
3	186,845 (13.90)	660,176 (28.67)	385,433 (49.11)	111,956 (8.33)
4	193,199 (13.55)	705,037 (28.81)	410,672 (49.46)	116,445 (8.17)
5	206,075 (12.98)	800,890 (28.58)	453,851 (50.44)	126,915 (7.99)
6	201,327 (13.23)	759,983 (28.64)	435,736 (49.94)	124,598 (8.19)
7	212,450 (13.19)	804,866 (28.62)	460,862 (49.98)	132,189 (8.21)
8	211,854 (13.27)	797,896 (28.24)	450,272 (50.04)	134,653 (8.45)
9	202,369 (12.61)	835,471 (27.13)	435,571 (52.04)	131,985 (8.22)
10	204,729 (13.30)	792,572 (26.76)	411,786 (51.50)	129,765 (8.43)
11	199,155 (14.27)	679,511 (28.35)	395,723 (48.69)	121,310 (8.69)
12	222,948 (11.90)	999,090 (27.30)	511,221 (53.34)	139,667 (7.46)

KTAS: Korean Triage and Acuity Scale.