title: Radiological research activity 1998-2007: relationship to gross domestic product, health expenditure and public expenditure on education.
abstract: OBJECTIVE: The purpose of this study was to evaluate the relationship of the radiological research activity from 1998 to 2007 to the gross domestic product (GDP), health expenditure and public expenditure on education.  METHODS: The population-adjusted research activity determined by the number of articles published, the cumulative impact factor (IF) and the cumulative IF per capita were correlated with per capita values of the GDP, health expenditure and public education expenditure. Linear regression analysis and multiple regression analysis were used for statistical analysis.  RESULTS: The cumulative IF per capita correlated with the GDP per capita (R = 0.94, P < 0.0001), health expenditure per capita (R = 0.93, P < 0.0001) and public expenditure on education per capita (R = 0.93, P < 0.0001). Multiple regression analysis demonstrated that public expenditure on education was an independent predictor of radiological research activity (P < 0.001), whereas the year, GDP and health expenditure did not reach statistical significance (P > 0.05).  CONCLUSION: Radiological research activity demonstrates a close relationship to the GDP, health expenditure and public expenditure on education. The last factor independently predicts research activity.
authors.forename: David
authors.initials: D
authors.lastname: Spitzmueller
authors.forename: Juerg
authors.initials: J
authors.lastname: Hodler
authors.forename: Burkhardt
authors.initials: B
authors.lastname: Seifert
authors.forename: Marco
authors.initials: M
authors.lastname: Zanetti