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Table 3 Characteristics of children 15–30 kg

From: Do epinephrine auto-injectors have an unsuitable needle length in children and adolescents at risk for anaphylaxis from food allergy?

Characteristics Total
(n = 102)
Patients with STBDmax t test
p value
≥12.7 mm
(n = 91)
<12.7 mm
(n = 11)
Age (months) median (IQR) 72 (48–84) 72 (48–84) 60 (48–78) 0.019
Males. n (%) 62 (60.4) 54 (59.3) 8 (72.3) 0.074
Weight (kg). mean (SD) 21.3 (4.0) 21.4 (3.9) 19.7 (4.2) ns
Height (m). mean (SD) 1.16 (0.12) 1.16 (0.12) 1.18 (0.15) ns
BMI (kg/m2). mean (SD) 15.8 (2.0) 16.1 (1.9) 14 (1.4) 0.0012
STMDmax (mm). mean(SD) 5.8 (1.5) 5.9 (1.5) 4.8 (1.0) 0.025
STMDmin (mm). mean (SD) 6.7 (1.7) 6.8 (1.7) 5.5 (1.3) 0.019
STBDmax (mm). mean (SD) 16.7 (3.0) 17.3 (2.5) 11.6 (0.9) <0.000001
STBDmin (mm). mean (SD) 29.5 (3.9) 30.0 (3.7) 25.4 (2.6) 0.0002
  1. Distance skin surface to bone with high pressure applied to the ultrasound probe (STBDmax). Data on one needle length 12.7 mm are given. Those with STBDmax < 12.7 mm. i.e., with a risk of penetrating the femur and those with more than 12.7 mm STBDmax. The differences between groups was tested by a two-tailed t-test. The inter-quartile ratio (IQR) percentage (%) and standard deviations (SD) are given within the brackets