As the figures show, it seems that the impact of the change from a traditional to a hybrid, flipped format affected all aptitude/ability segments of the student population approximately equally. For the spring 2012efall 2012 contrast, we found a 3e4 point advantage for the hybrid-flipped version of the class in the lower three quartiles, and a 1-point advantage in the top quartile. For the spring 2012espring 2013 contrast, we found small advantages (0.5e2 points) for the hybrid-flipped version in the bottom two and top quartiles, along with a 0.35- point nominal advantage for the traditional version in the second-highest quartile.