Recently I was wondering whether some languages are inherently more comprehensible when spoken, than others. Has this been measured in any way?
To make things more precise, let's define a "please say again" (PSA) phrase a remark uttered by someone who didn't get the last sentence. In English, "Pardon me", "Say again", "What's that?" etc. could count as PSA phrases.
One way to possibly measure oral comprehensibility is to record a conversation between people in a language they speak as mother tongue, and count, how often PSA phrases occur.
Has this been done, or has oral comprehensibility been compared in another way? Or is there no meaningful way to measure and compare oral comprehensibility?