Figure 2. (Left) The percent of catheters which kinked in 15 trials when inserted at 0, 5, 10, 15, 20, 25, and 30 degrees angles of insertion for every small-angle bend of the catheter. With increasing angle of insertion and/or small-angle bend of the catheter the percent of catheters which kinked progressively decreased. (Right) The percent of catheters which kinked for every given cumulative angle (angle of insertion plus small-angle bend) is graphed. Whereas 98% of the catheters kinked with a cumulative angle of 10 degrees, 0 kinked with a cumulative angle of 30 degrees. Analysis via the chi-squared test yielded a P value of < 0.0001 when comparing incidence of kinking for cumulative angles 10–30 degrees.