The World Health Organization's annual reports feature statistics on global health indicators such as life expectancy and mortality, cause-specific mortality and morbidity, selected infectious diseases, health expenditures and health inequalities. Because the underlying empirical data in many countries is relatively unreliable, a number of the statistics presented in the reports are associated with significant uncertainty.
The World Health Organization's statistics on life expectancy and mortality include each country's life expectancy from birth, life expectancy at 60 years and infant mortality rates. The World Health Organization also tracks statistics on certain infectious diseases such as malaria, mumps, rubella, meningitis and cholera. The group's statistics on health service coverage include births attended by skilled health personnel, births by caesarean section, immunization coverage among one-year-olds, treatment success rate for new tuberculosis cases and children aged less than five years who sleep under insecticide-treated nets.
The World Health Organization tracks other statistics related to health services and groups most of them under health expenditures and health inequalities. Examples of such health statistics include breakdowns of each country's total expenditure on health as a percentage of gross domestic product, social security expenditure on health as a percentage of general government expenditure on health and the prevalence of certain methods of contraception.