Table 1.

Likert's scale

Likert's score	Localization of vein and ease of catheterization
Score 1	Vein is not localized and catheterization is not possible
Score 2	The vein is localized but difficult to catheterization
Score 3	View is appropriate but a search for a better view is required in order to catheterize
Score 4	Good view found and will not search for another view. Catheterization is done comfortably
Score 5	Excellent view found and catheterization is easy