Figure 2. Analysis interface of the video editing software. The video was deconstructed into frames as shown on the timelines. Depending on the value of irrigation pressure (SDIOP), all frames were categorized into two levels: Level 1 (top, SDIOP < 90cm H2O), and Level 2 (bottom, SDIOP ≥ 90cm H2O). The duration of each frame was 0.3 second. The cumulative duration of each level was then calculated.
