“…There were six unique study designs applied to QI publications, of which 34 studies (49%) 28,32-34,36,37,39,41,42,45-48,50-53,55,58,59,67,68,70,72,74,77,95-102 used a pre-post design. The second most commonly used design was an adaptive-iterative design ( n = 17, 24%) 29,30,35,38,54,56,57,61,63-66,73,75,78,80,93 in which studies reported using multiple cycles of improvement that were informed and adapted based on initial successes or failures.…”