Table 1.
Pearson’s r (above the diagonal) and Spearman’s rho (below the diagonal) between the opportunity for selection (Is) and dementia incidence.
| All ages | 15–49 years old | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dementia incidence | Is | Ageing | GDP PPP | Urban | Dementia incidence | Is | Ageing | GDP PPP | Urban | ||
| Dementia incidence | 1 | − 0.827*** | 0.773*** | 0.724*** | 0.518*** | Dementia incidence | 1 | − 0.857*** | 0.752*** | 0.793*** | 0.555*** |
| Is | − 0.830*** | 1 | − 0.827*** | − 0.866*** | − 0.594*** | Is | − 0.861*** | 1 | − 0.827*** | − 0.866*** | − 0.594*** |
| Ageing | 0.776*** | − 0.835*** | 1 | 0.754*** | 0.560*** | Ageing | 0.752*** | − 0.827*** | 1 | 0.754*** | 0.560*** |
| GDP PPP | 0.732*** | − 0.877*** | 0.767*** | 1 | 0.698*** | GDP PPP | 0.793*** | − 0.866*** | 0.754*** | 1 | 0.698*** |
| Urbanization | 0.522*** | − 0.647*** | 0.645*** | 0.738*** | 1 | Urbanization | 0.555*** | − 0.594*** | 0.560*** | 0.698*** | 1 |
Significance level: *p < 0.05; **p < 0.01; ***p < 0.001; Sample size range: 175–204.
Data sources: Dementia Incidence expressed as the number of new onsets of Alzheimer's disease and other dementias published by the Institute for Health Metrics and Evaluation (IHME) in 2020; Is measuring the magnitude of the opportunity for natural selection, extracted from the previous publication by You et al. https://doi.org/10.1111/eva.12523; Ageing expressed with life expectancy at 65 years old (2010–2015) published by the United Nations; GDP PPP expressed in purchasing power parity in 2015 US dollars published by the World Bank; Urbanization expressed in percent of population living in urban areas in 2015 published by the World Bank.