Page 174 - Ultrasonography in Prehospital and Emergency Medicine - Rein Ketelaars

n (%)
Range
Mean ± SD
172
Chapter 8
numeric rating scale (NRS) where 1 = extremely difficult and 10 = extremely easy. We encour- aged the HEMS-personnel to enter additional free text to supplement or clarify the data.
As part of regular operations, an electronic record is created on every mission and treated patient. Records are stored in the custom-made HEMS database stored on a secure server and backed up daily. We linked the CRFs to the database by mission ID and we extracted additional relevant data: date of birth, sex, estimated body weight, and cause of the cardiac arrest.
Data analysis
We entered the data from the forms and relevant data from the database into a Castor data- base (Ciwit B.V., Amsterdam, the Netherlands) for secure storage and to comply with good clinical practice standards. After data acquisition was complete, we used IBM SPSS Statistics for Windows, version 22.0 (IBM Corp., Armonk, NY, USA) for analysis.
Statistical analysis
We report normally distributed data as mean ± standard deviation (SD), and data with a skewed distribution as median with an interquartile range (IQR). We used Tukey’s hinge technique to determine the IQR. Spearman correlation coefficient was used to qualify the relationship between body weight and image quality and the reported ease of the procedure. We considered statistical significance at a p–value < .05.
Table 8.1
Age (years) 0–17
>= 18 Gender Male
Female
Weight of adults (kg)
SD, standard deviation.
Demographics
56 0–90 11 (20)
45 (80)
40 (71) 16 (29)
44 40–125
42.9 ± 27.6
83 ± 18