...The first result of this study to be discussed is the observation that a great majority of the members of the Boston Church of Christ changed psychological type scores in the past, present, and future versions of the MBTI. Among the 835 individuals who took all three forms of the MBTI, less than five percent showed no change at all and less than seven percent had the same past and future type. Among the rest, a comparison of past and future types showed that almost 20 percent changed on one MBTI scale, 35 percent changed on two, over 26 percent changed on three, and over 12 percent changed on all four scales, thus experiencing a total reversal of type. The mean number of scale changes was 2.18 among the 835 members of the Boston Church of Christ who took all three forms of the MBTI. The present distribution was significantly different from the past distribution. The difference between past and future type distributions was highly significant.
A second result of this study that must be noticed is that the observed changes in psychological type scores were not random since there was a clear convergence in a single type. Ten of the 16 types show a steady decline in the percentage who came out as that type in the past, present, and future versions of the MBTI. Three transitional types show an increase from past to present and then a sharp decline in the future outcomes. There were three popular types in this study: ESFJ, ESTJ, and ENFJ.
There was a steady increase in the percentage who came out with these three type indications in the past, present, and future results Percentages are figured separately for males and females since male and female distributions differ on the thinking-feeling scale. In the past, present, and future results, the percentage of males who came out ESFJ went from 2.58 to 26.37 to to 54.23 while the percentages for females went from 5.10 to 34.31 to 53.48. ESTJs differ from ESFJs only on the thinking-feeling scale. The percentage of males who scored as ESTJ went from 7.73 to 15.92 to 20.37 while the percentages for females went from 4.67 to 13.81 to 23.04. ENFJs differ from ESFJs only on the sensing-intuition scale. The percentages of males who came out ENFJ went from 1.29 to 4.73 to 14.81, while the percentages for females went from 0.64 to 3.97 to 12 17....