Perhaps a similar study could be done in, say, India.

I'm not sure if it's due to their being used to loud/disturbing noise , or if Indians in general have some kind of ongoing inner Zen, but the amount of noise that the general population seems to completely ignore (e.g. a vehicle loudly and continuously honking right behind you as you walk) is really quite impressive.

I remember eating dinner at a restaurant in Rishikesh one night in a quiet remote-ish area. There were some workers about to unload a truck, and just in front of them on the restaurant grounds was a multi-generational Indian family all together enjoying their meal. I saw two of the workers casually hurl this big piece of sheet metal onto a metal trailer, resulting in a massive clash of ear piercing noise that the family somehow just ignored, not a head turn of annoyance (as would be typical in the west), just continue the conversation without skipping a beat -- amazing.