Most excellent! This is really useful information (with emphasis on the word "useful." Thanks sociology geek.
My own testing is "field testing." I have no need for fecal simulants. As my bowel program includes prescribed laxatives, I have ample opportunity for real world fecal testing of any diaper.
Of course, my preference is for diapers with very tall internal standing leak guards. Any diaper with leak guards 1.5" tall usually will perform quite well. Those with leak guards shorter than .75" may be serviceable but usually are to be avoided.
However, I have been pleased with how well many diapers with shorter leak guards perform. For those diapers, I think the factor that improves fecal containment is a very wide crotch width so that there is more space for containment before stool pushes against the leak guards.
My current preferred daily diapers are BetterDry and Megamax. Next down on the list is the NorthShore Supreme. The breathable version of the Supreme has the same leak guards but of course will transmit fecal odor much more.
My "in between" diaper for briefer periods when I don't want to put on a premium diaper is NorthShore Supreme Lite. This is a good example of the wider crotch helping fecal containment.
For "cheap" diapers, I have found that the fit and the ability to adjust the tapes for snug fits at the thighs and waist are significant factors.
Of course, I always wear "plastic" pants. I think rubber pants generally transmit less fecal odor than other materials.
I should note that my laxatives and stool softeners are adjusted to keep stool between Bristol 3 and Bristol 4. However, semi-liquid stool does occur.
Good Lord, the things we talk about in this forum!
--John
(double incontinent)