If you're going to look at a chart that was lifted from some other work, it may pay to go back to the source and look at more than a conveniently copied snapshot of a small piece of the work.
Here's a link to a source where you can read the info posted by the author of the Greg Ellifritz study:
https://www.buckeyefirearms.org/alternate-look-handgun-stopping-power
Now, context is pretty important, but so is looking at all the data and statistics he developed.
For example, in his project he was able to come up with 25 people who were shot by .32's, meaning both .32ACP and .32Long.
.32 (both .32 Long and .32 ACP)
# of people shot - 25
# of hits - 38
% of hits that were fatal - 21%
Average number of rounds until incapacitation - 1.52
% of people who were not incapacitated - 40%
One-shot-stop % - 40%
Accuracy (head and torso hits) - 78%
% actually incapacitated by one shot (torso or head hit) - 72%
Browse through the rest of the chart where he lists the same statistical data for all the other calibers he studied. Look at the varying number of people involved for each caliber, and how the statistics would break down. Makes using just one type of calculated percentage and category about as useful and clear as mud.
He makes some interesting observations and comments in his article, and it's worth reading. Here are a couple snippets for review, though ...
I really would have liked to break it down by individual bullet type, but I didn't have enough data points to reach a level of statistical significance. Getting accurate data on nearly 1800 shootings was hard work. I couldn't imagine breaking it down farther than what I did here. I also believe the data for the .25, .32 and .44 magnum should be viewed with suspicion. I simply don't have enough data (in comparison to the other calibers) to draw an accurate comparison. I reported the data I have, but I really don't believe that a .32 ACP incapacitates people at a higher rate than the .45 ACP!
...
Another data piece that leads me to believe that the majority of commonly carried defensive rounds are similar in stopping power is the fact that all four have very similar failure rates. If you look at the percentage of shootings that did not result in incapacitation, the numbers are almost identical. The .38, 9mm, .40, and .45 all had failure rates of between 13% and 17%.
...
The lower caliber rounds (.22, .25, .32) had a failure rate that was roughly double that of the higher caliber rounds. The one-shot-stop percentage (where I considered all hits, anywhere on the body) trended generally higher as the round gets more powerful. This tells us a couple of things.
...
This study took me a long time and a lot of effort to complete. Despite the work it took, I'm glad I did it. The results I got from the study lead me to believe that there really isn't that much difference between most defensive handgun rounds and calibers. None is a death ray, but most work adequately...even the lowly .22s. I've stopped worrying about trying to find the "ultimate" bullet. There isn't one. And I've stopped feeling the need to strap on my .45 every time I leave the house out of fear that my 9mm doesn't have enough "stopping power." Folks, carry what you want. Caliber really isn't all that important.
One of the important conclusions he derived from his project?
Caliber really isn't all that important.
Or, looked at from another perspective ... TANSTAAFL
How very unsurprising.