All of the correlations are statistically significant, with p < .001. As the data shows, the correlation between the GDP and the incidence and mortality rates are weak positive, with a value of rs = .295 and rs = .346, respectively, whereas the correlation between the GDP per capita and the mortality rate is moderate positive, with rs = .521. It is notable that the correlation between the GDP per capita and the incidence rate is strong positive, with rs = .656.
In order to get a closer look at what is happening at different economic levels, the different countries are stratified according to their income levels. With this in mind, the results for low-income countries that have a GNI per capita of less than or equal to 1,035 US$ are shown in Table 4. It is notable that there are no significant correlations between the four pairs.