"6,000 adult US military personnel (4,082 men and 1,986 women)." .... "Despite the presence of reservists in the sample, it is still not an approximation of the US Civilian population"

This dataset is from the US military so please remember that when you think about generalising these results to the rest of the world.

Since everyone is talking about it Ear Protrusion 'might' be strongly correlated to height IF you don't exclude short people from the sample set.