While the CRTT ostensibly measures how much unpleasant, or even harmful, noise a participant is willing to administer to a nonexistent confederate, that amount of noise can be extracted as a measure in myriad different ways using various combinations of volume and duration over one or more trials. There are currently 130 publications that report using the CRTT stored in the database, and they reported 156 different quantification strategies in total.
The number of quantification strategies appears to be growing proportionally to the number of publications that use the CRTT, and at no point in time since its first use were there more publications than different quantification strategies. That is, although the total number of unique quantification strategies has grown substantially in 30 years, new ones keep being added.
The usage frequency of quantification strategies shows a clear Poisson distribution. The vast majority of unique quantification strategies are not reported in more than one publication, and only very few are reported in more than 10 publications.
Next to the individual differences between unique quantification strategies, there is also no standardization in the number of quantification strategies reported per publication. Most publications report results from one or two quantification strategies, but some report up to 10 different quantification strategies.