Table 2 Standardized Mean Differences of the variables before and after matching
Characteristic | In-hospital IBP, unmatched sample | Prehospital IBP, unmatched sample | SMD (unmatched) | In-hospital IBP, matched sample | Prehospital IBP, matched sample | SMD (matched) |
|---|---|---|---|---|---|---|
n | 33 | 67 | 33 | 33 | ||
Age [years] – median (25 th to 75 th percentile) | 71 (62–79) | 72 (59–81) | 0.0187 | 71 (62–79) | 72 (61–80) | 0.0340 |
Male sex – n (%) | 21 (64) | 36 (54) | 0.0991 | 21 (64) | 19 (58) | 0.0606 |
Initial Glasgow Coma Scale – median (25 th to 75 th percentile) | 5 (4–7) | 5 (4–7) | −0.3064 | 5 (4–7) | 5 (4–7) | −0.1519 |
Mode of Transport – n (%) | −0.1696 | −0.0303 | ||||
Ground based | 21 (64) | 54 (81) | 22 (67) | 24 (73) | ||
HEMS | 12 (36) | 13 (19) | 11 (33) | 9 (27) |