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Table 2 Correlation of number of trials (if >0) vs each variable

From: Gross Domestic Product (GDP) and productivity of schizophrenia trials: an ecological study

Variable r 95% CI for r r2
GDP (in million US $) 0.87 0.79 to 0.92 0.76
Population (in thousands) 0.14 -0.11 to 0.38 0.02
GDP/Capita (US $) 0.31 0.06 to 0.52 0.10
Telephones/per 100 inhabitants 0.30 0.06 to 0.52 0.09