Figure 2: The IJV depth, the diameter of IJV and CA, CA overlap according to Group Values are mean. *: P < 0.05 compared with Group I, †: P < 0.05 compared with Group II. ‡: P < 0.05 compared with 0° Trendelenburg tilt and 0° of head rotation (among groups) §: P < 0.05 compared with previous values (among groups).