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Table 1 Characteristics of the total study population

From: Real-time ultrasound-guided catheterisation of the internal jugular vein: a prospective comparison with the landmark technique in critical care patients

Characteristics Ultrasound group (n = 450) Landmark group (n = 450)
Age (years)a 58.3 ± 10.3 59 ± 9.5
Gender (male/female ratio)a 0.56 ± 0.4 0.6 ± 0.4
Side of catheterisation (left/right) 222/228 218/232
Body mass index (kg/m2)a 24.1 ± 5.3 23.7 ± 5.9
Prior catheterisation 85 (18.8%) 76 (16.8%)
Limited sites for access attempts 51 (11.3%) 55 (12.2%)
Previous difficulties during catheterisation 44 (9.7%) 40 (8.8%)
Previous mechanical complication 18 (4%) 20 (4.4%)
Known vascular abnormality 4 (0.8%) 3 (0.6%)
Untreated coagulopathy 25 (5.5%) 24 (5.3%)
Skeletal deformity 15 (3.3%) 13 (2.8%)
Cannulation during cardiac arrest 31 (6.8%) 35 (7.7%)
  1. aValues are presented as mean ± standard deviation.