Table 2.
Pearson's r and nonparametric correlation matrix between all variables.
| UV radiation | Dementia incidence | Genetic predisposition | Economic affluence | Urbanization | Aging | |
|---|---|---|---|---|---|---|
| UV radiation | 1 | −0.764*** | −0.482*** | −0.549*** | −0.464*** | −0.565*** |
| Dementia Incidence | −0.704*** | 1 | 0.590*** | 0.582*** | 0.483*** | 0.717*** |
| Genetic predisposition | −0.630*** | 0.833*** | 1 | 0.567*** | 0.523*** | 0.876*** |
| Affluence | −0.624*** | 0.759*** | 0.895*** | 1 | 0.649*** | 0.733*** |
| Urbanization | −0.473*** | 0.510*** | 0.630*** | 0.720*** | 1 | 0.604*** |
| Aging | −0.610*** | 0.810*** | 0.930*** | 0.880*** | 0.640*** | 1 |
Note: Pearson r (above diagonal) and nonparametric rho (below diagonal) correlations were reported. Ultraviolet Radiation (UVR), expressed as the average daily ambient ultraviolet radiation level (in J/m2), the World Health Organization; Dementia incidence rate, the number of new cases per 100,000 people diagnosed in 2019 Institute for Health Metrics and Evaluation of University of Washington; Economic affluence, per capita GDP PPP, measured with the per capita purchasing power parity (PPP) value of all final goods and services produced within a territory in a given year (2018), the World Bank; Genetic predisposition (Biological State Index, Ibs), dementia genetic background predisposition level due to reduced natural selection, downloaded from previous publication [32]; Aging, measured with life expectancy at birth (e(0)), the number of years a newborn infant would live if prevailing patterns of mortality at the time of its birth were to stay the same throughout its life, 2018, the World Bank.
Significance levels: p < 0.001. Number of country range, 181–198.