Net migration rate: -3.62 migrant(s)/1,000 population (2000 est.)
Sex ratio: at birth: 1.03 male(s)/female under 15 years: 1.03 male(s)/female 15-64 years: 0.93 male(s)/female 65 years and over: 0.84 male(s)/female total population: 0.97 male(s)/female (2000 est.)
Infant mortality rate: 50.41 deaths/1,000 live births (2000 est.)
Life expectancy at birth: total population: 65.25 years male: 63.84 years female: 66.7 years (2000 est.)
Total fertility rate: 6.08 children born/woman (2000 est.)
Nationality: noun: Sao Tomean(s) adjective: Sao Tomean
Ethnic groups: mestico, angolares (descendants of Angolan slaves), forros (descendants of freed slaves), servicais (contract laborers from Angola, Mozambique, and Cape Verde), tongas (children of servicais born on the islands), Europeans (primarily Portuguese)
Religions: Christian 80% (Roman Catholic, Evangelical Protestant,
Seventh-Day Adventist)
Languages: Portuguese (official)
Literacy: definition: age 15 and over can read and write total population: 73% male: 85% female: 62% (1991 est.)