## Different letters indicate statistically significant differences between groups

Recently I stumbled upon a paper that used different letters to show statistical significances between groups. Aka different significance levels were denoted with different letters (a, b, c). The meaning behind the letters is likely immediately apparent to a more seasoned researcher, though it was not obvious to me at first. For variables with the same letter, the difference is not statistically significant. Likewise, for variables with a different letter, the difference is statistically significant. In the figure below, taken…