Death rate: 17.25 deaths/1,000 population (1998 est.)
Net migration rate: 11.18 migrant(s)/1,000 population (1998 est.)
Sex ratio: at birth: 1.03 male(s)/female under 15 years: 0.96 male(s)/female 15-64 years: 0.91 male(s)/female 65 years and over: 1.02 male(s)/female (1998 est.)
Infant mortality rate: 129.38 deaths/1,000 live births (1998 est.)
Life expectancy at birth: total population: 48.57 years male: 45.56 years female: 51.66 years (1998 est.)
Total fertility rate: 6.23 children born/woman (1998 est.)
Nationality: noun: Sierra Leonean(s) adjective: Sierra Leonean
Ethnic groups: 20 native African tribes 90% (Temne 30%, Mende 30%, other 30%), Creole 10% (descendents of freed Jamaican slaves who were settled in the Freetown area in the late-eighteenth century), refugees from Liberia's recent civil war, small numbers of Europeans, Lebanese, Pakistanis and Indians
Religions: Muslim 60%, indigenous beliefs 30%, Christian 10%
Languages: English (official, regular use limited to literate minority), Mende (principal vernacular in the south), Temne (principal vernacular in the north), Krio (English-based Creole, spoken by the descendents of freed Jamaican slaves who were settled in the Freetown area, a lingua franca and a first language for 10% of the population but understood by 95%)