So...if 21 people voted that they have the same Thinking/Feeling dichotomy...there are 11 votes for a difference in the I/E, I/S, and J/P dichotomies. In addition, because it is known that 28 people voted, it can be calculated how many votes were not used because people weren't sure if one of the dichotomies was the same or different. For the I/E, I/S, and J/P dichotomies, this is 6 votes.

This could mean that of the 21 people who voted that they have the same Thinking/Feeling dichotomy in both systems, 17 of them could be different in one other dichotomy, or be uncertain. 4/21 = 19%, or 14% of the people who took part.