Table 3.
Arrival time and month of patients, n (%).
| Appropriate EMS usage | Appropriate no EMS usage | Underuse | Overuse | p | |
|---|---|---|---|---|---|
| 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 | p < 0.0001 | ||||
| 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 | p < 0.0001 | ||||
| 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 | p < 0.0001 | ||||
| 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.