Table 2 Mission characteristics pre and post HEMS coordinator introduction
Total N = 3006 | Preintervention | Postintervention | Difference pre/post | P-value | ||
|---|---|---|---|---|---|---|
Unit | Unit | |||||
Mission distribution within region | % (n) | % | 0.07 1 | |||
Trondheim HEMS | 52.8 (1110) | 49.2 (445) | -3.6 | |||
Ålesund HEMS | 31.7 (667) | 36.0(326) | 4.3 | |||
Ørland SAR | 15.4 (324) | 14.8 (134) | -0.6 | |||
Mean response time | mm:ss (± SD) | |||||
All bases | 31:03 (± 24 s) | 31:56 (± 33 s) | ||||
Trondheim HEMS | 32:14 (± 30 s) | 32:53 (± 48 s) | ||||
Ålesund HEMS | 26:31 (± 33 s) | 29:21 (± 45 s) | ||||
Ørland SAR | 36:22 (± 98 s) | 35:05 (± 105 s) | ||||
Missions within 45 min threshold | % (n) | % | ||||
All bases | 88.2 (1853) | 86.7 (785) | -1.5 | 0.26 1 | ||
Trondheim HEMS | 87.7 (973) | 87.4 (389) | -0.3 | 0.90 1 | ||
Ålesund HEMS | 93.4 (623) | 88.7 (289) | -4.7 | 0.01 1 | ||
Ørland SAR | 79.3 (257) | 79.9 (107) | 0.6 | 0.90 1 | ||
In-flight scrambles | % (n) | % | ||||
All bases | 12.6 (265) | 11.2 (101) | -1.4 | 0.26 1 | ||
Trondheim HEMS | 6.9 (77) | 5.2 (23) | -1.7 | 0.20 1 | ||
Ålesund HEMS | 19.2 (128) | 16.6 (54) | -2.6 | 0.32 1 | ||
Ørland SAR | 18.5 (60) | 17.9 (24) | -0.6 | 0.90 1 | ||
Median geodesic mission distance | km/IQR (n) | %/km(95% CI3) | ||||
All bases | 56/54.4 (2044) | 59.1/55.9 (896) | 5.5/3.1 (-1.3, 4.5) | 0.29 2 | ||
Trondheim HEMS | 66.8/49.5 (1080) | 72.6/45.6 (441) | 8.7/5.8 (2.5,10.1) | < 0.0012 | ||
Ålesund HEMS | 51/46.3 (651) | 46.9/51.9 (322) | -8.0/-4.1 (-8.7,0.2) | 0.068 2 | ||
Ørland SAR | 41.4/40.9(313) | 42.3/45.5 (133) | 2.0/0.9 (-5.2,7.4) | 0.75 2 | ||
Convex hull (95% percentile) area | km2 | %/km2 | ||||
Trondheim HEMS | 41553 | 43198 | 4.0/1645 | |||
Ålesund HEMS | 49755 | 28785 | -42.1/-20970 | |||
Ørland SAR | 32946 | 23739 | -27.9/-9207 | |||