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. 2021 Nov 11;115:113–125. doi: 10.1016/j.tranpol.2021.10.021
Clustering coefficient Africa Asia Europe North A.. Oceania South A.. World
(Low) 1st quintile 12% 19% 20% 30% 28% 15% 20%
2nd quintile 21% 16% 20% 25% 16% 31% 20%
3rd quintile 25% 19% 23% 17% 28% 25% 22%
4th quintile 25% 19% 23% 7% 13% 13% 18%
(High) 5th quintile 16% 26% 14% 22% 16% 15% 20%
Total 100% 100% 100% 100% 100% 100% 100%