Table 2.
Minor and major injury helicopter transports stratified by trauma center characteristics
| Characteristic | Overall | Minor Injury (AIS< 3) |
Severe Injury (AIS ≥ 3) |
||||
|---|---|---|---|---|---|---|---|
| Weighted N |
Column Percent |
Weighted N |
Column Percent |
Weighted N |
Column Percent |
P | |
| Region | 0.255 | ||||||
| Midwest | 12,543 | 16 | 4,648 | 17 | 7,895 | 16 | |
| Northeast | 5,645 | 7 | 1,959 | 7 | 3,686 | 8 | |
| South | 43,773 | 58 | 16,532 | 60 | 27,240 | 56 | |
| West | 14,130 | 19 | 4,534 | 16 | 9,597 | 20 | |
| Designation | 0.474 | ||||||
| Level I | 56,041 | 74 | 20,115 | 73 | 35,926 | 74 | |
| Level II | 20,049 | 26 | 7,557 | 27 | 12,492 | 26 | |
| Mean annual trauma volume | <0.001 | ||||||
| First quartile (53-1,469) | 19,024 | 25 | 7,154 | 26 | 11,870 | 25 | |
| Second quartile (1,474-1,978) | 19,067 | 25 | 8,333 | 30 | 10,735 | 22 | |
| Third quartile (2,054-2,876) | 20,972 | 28 | 6,899 | 25 | 14,072 | 29 | |
| Fourth quartile (3,032-5,894) | 17,028 | 22 | 5,286 | 19 | 11,741 | 24 | |
| Mean annual HEMS volume | <0.001 | ||||||
| First quartile (1-216) | 20,402 | 27 | 6,994 | 25 | 13,408 | 28 | |
| Second quartile (221-294) | 19,117 | 25 | 8,643 | 31 | 10,474 | 22 | |
| Third quartile (301-381) | 18,115 | 24 | 6,123 | 22 | 11,992 | 25 | |
| Fourth quartile (386-642) | 18,456 | 24 | 5,912 | 21 | 12,544 | 26 | |
| % EMS transports by helicopter | 0.001 | ||||||
| First quartile (0-10) | 19,514 | 26 | 6,341 | 23 | 13,173 | 27 | |
| Second quartile (11-14) | 20,196 | 27 | 6,428 | 23 | 13,768 | 28 | |
| Third quartile (14-18) | 18,220 | 24 | 7,923 | 29 | 10,297 | 21 | |
| Fourth quartile (19-31) | 18,161 | 24 | 6,980 | 25 | 11,180 | 23 | |
| % Ground EMS AIS < 3 | <0.001 | ||||||
| First quartile (10-26) | 19,199 | 25 | 6,252 | 23 | 12,948 | 27 | |
| Second quartile (26-33) | 19,425 | 26 | 5,828 | 21 | 13,597 | 28 | |
| Third quartile (33-37) | 18,691 | 25 | 7,815 | 28 | 10,877 | 22 | |
| Fourth quartile (38-71) | 18,775 | 25 | 7,778 | 28 | 10,997 | 23 | |
| Mean total ground EMS time | <0.154 | ||||||
| First quartile (33-43) | 19,434 | 26 | 7,405 | 27 | 12,030 | 25 | |
| Second quartile (43-46) | 19,016 | 25 | 6,558 | 24 | 12,458 | 26 | |
| Third quartile (46-48) | 21,780 | 29 | 8,541 | 31 | 13,239 | 27 | |
| Fourth quartile (48-63) | 15,784 | 21 | 5,124 | 19 | 10,659 | 22 | |
| Mean total helicopter EMS time | <0.001 | ||||||
| First quartile (39-56) | 19,034 | 25 | 7,850 | 29 | 11,184 | 23 | |
| Second quartile (56-63) | 22,488 | 30 | 8,719 | 32 | 13,768 | 29 | |
| Third quartile (64-70) | 16,104 | 21 | 4,750 | 17 | 11,354 | 24 | |
| Fourth quartile (72-104) | 18,083 | 24 | 6,223 | 23 | 11,859 | 25 | |
HEMS = helicopter EMS; AIS = Abbreviated Injury Scale