What proportion of scuba divers can equalize ears "no hands"?

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In my pod, it's 1 out of 5, eldest son almost never needs the nose pinch, only when congested.
 
With my current mouth piece I rarely need to manually equalize. Some thing about the position my jaw is in while holding it.
 
Sure, both ears. I can open the canals in question by some muscle movement, used to do while humming to myself since I was a kid.
 
From my representative sample of 2: 50%, with P=0.5
 
Based on what I see in my buddies, most folks do something involving a grasp of their nose. Valsalva does absolutely nothing for me, so I have to do an extremely awkward roll of my head to point both ears skyward alternately. It is technically not using my hands, though!
 
I can. I wonder how many others can but don't realize it. If you yawn (not underwater...) you hear a crackling sound in your ears. You can "hold" things in that position (it actually will muffle your hearing--I do that if a loud noise on the street approaches). This is what I do to equalize (not the yawning part, just finding that position where it crackles).
The only time it may not work is if I descend really fast say, down an anchor line. Then I have to sneak in a swallow or two. But never need hands.
If you swallow, you may also hear the crackling sound--that's another way to find the "position".
 
I can. I wonder how many others can but don't realize it. If you yawn (not underwater...) you hear a crackling sound in your ears. You can "hold" things in that position (it actually will muffle your hearing--I do that if a loud noise on the street approaches). This is what I do to equalize (not the yawning part, just finding that position where it crackles)
I'm trying this out in the dog park. Why are people looking at me like I'm nuts?
 
Never heard of that state. Is it a new one?
CT gave me ~4 really bad antibiotic & horse pill sized decongestants required sinus infections every year. RI & MA decreased that to once or twice a year. VA is once every couple of years and no horse pill decongestants.
 

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