▁Str ucture ▁of ▁the ▁population ▁▁ ▁Str ucture ▁of ▁the ▁population ▁( 0 1 . 0 7 . 2 0 0 9 ) ▁( Est im ates ) ▁: ▁ ▁Str ucture ▁of ▁the ▁population ▁( 0 1 . 0 7 . 2 0 1 2 ) ▁( Est im ates ) ▁: ▁ ▁V ital ▁statistics ▁ ▁UN ▁estimates ▁ ▁B irth s ▁and ▁death s ▁ ▁Life ▁expect ancy ▁at ▁birth ▁ ▁Eth nic ▁groups ▁According ▁to ▁the ▁C IA , ▁O man ' s ▁population ▁primarily ▁consists ▁of ▁Arab , ▁Bal uch i , ▁South ▁Asian ▁( Ind ian , ▁Pak ist ani , ▁Sri ▁L ank an , ▁Bang l ades hi ), ▁and ▁African ▁eth nic ▁groups . ▁ ▁O man i ▁society ▁is ▁largely ▁trib al . ▁O man ▁has ▁three ▁known ▁types ▁of ▁ident ities . ▁Two ▁of ▁these ▁ident ities ▁are ▁' t rib al ism ' ▁and ▁' I bad ism '; ▁the ▁third ▁identity ▁is ▁linked ▁to ▁' mar itime ▁trade '. ▁The ▁first ▁two ▁ident ities ▁are ▁w ides p read ▁in ▁the ▁interior ▁of ▁O man ; ▁these ▁ident ities ▁are ▁closely ▁tried ▁to ▁tradition , ▁as ▁a ▁result ▁of ▁length y ▁periods ▁of ▁isol ation . ▁The ▁third ▁identity , ▁which ▁per tain s ▁to ▁Mus cat ▁and ▁the ▁coast al ▁areas ▁of ▁O man , ▁is ▁an ▁identity ▁that ▁has ▁become ▁emb od ied ▁in ▁business ▁and ▁trade . ▁The ▁third ▁identity ▁is ▁generally ▁seen ▁to ▁be ▁more ▁open