There is a relationship between life expectancy and fertility. How higher the fertility rate, how lower the life expectancy. For those countries with a high life expectancy, the US scores 37 of the 194 countries in the world. In the top 10, we see only 3 European countries. For those countries with a high fertility rate, the US scores 127 from the 194 countries. Only African countries occupy the top 9 of the highest fertility rate. Afghanistan rates number 10.

Here is the table with the top 20 countries based on life expectancy:
| Country | Life expectancy rank | Life expectancy Years | Fertility rank | Fertility Rate |
| Japan | 1 | 83.7 | 182 | 1.4 |
| Switzerland | 2 | 83.1 | 161 | 1.6 |
| San Marino | 3 | 83.1 | 170 | 1.5 |
| Singapore | 4 | 82.9 | 190 | 0.8 |
| Italy | 5 | 82.9 | 180 | 1.4 |
| Andorra | 6 | 82.7 | 184 | 1.4 |
| Spain | 7 | 82.6 | 169 | 1.5 |
| Australia | 8 | 82.6 | 140 | 1.8 |
| Israel | 9 | 82.5 | 67 | 2.7 |
| Iceland | 10 | 82.4 | 110 | 2 |
| Luxembourg | 11 | 82.2 | 153 | 1.6 |
| Monaco | 12 | 82.2 | 164 | 1.5 |
| New Zealand | 13 | 82.1 | 108 | 2 |
| France | 14 | 82 | 101 | 2.1 |
| Canada | 15 | 82 | 157 | 1.6 |
| Cyprus | 16 | 81.9 | 174 | 1.5 |
| Sweden | 17 | 81.8 | 125 | 1.9 |
| Norway | 18 | 81.8 | 128 | 1.9 |
| South Korea | 19 | 81.6 | 189 | 1.3 |
| Netherlands | 20 | 81.4 | 139 | 1.8 |
Here is the table with the top 20 countries with high fertility rate:
| Country | Life expectancy rank | Life expectancy Years | Fertility rank | Fertility Rate |
| Niger | 169 | 59.3 | 1 | 6.8 |
| Burundi | 181 | 56.2 | 2 | 6.1 |
| Mali | 178 | 57.2 | 3 | 6.1 |
| Somalia | 184 | 54.4 | 4 | 6 |
| Uganda | 174 | 58.5 | 5 | 5.9 |
| Burkina Faso | 173 | 58.6 | 6 | 5.9 |
| Zambia | 175 | 58.5 | 7 | 5.7 |
| Malawi | 168 | 59.6 | 8 | 5.6 |
| Angola | 190 | 51.7 | 9 | 5.4 |
| Afghanistan | 165 | 61.3 | 10 | 5.3 |
| Mozambique | 185 | 54.2 | 12 | 5.2 |
| Nigeria | 183 | 54.5 | 13 | 5.2 |
| Ethiopia | 146 | 64.7 | 14 | 5.2 |
| Timor-Leste | 139 | 66.9 | 15 | 5 |
| Benin | 171 | 58.8 | 16 | 5 |
| Tanzania | 159 | 62.7 | 17 | 4.9 |
| Guinea | 177 | 58.3 | 18 | 4.9 |
| Sierra Leone | 194 | 46 | 19 | 4.8 |
| Cameroon | 179 | 56.6 | 20 | 4.8 |
| Liberia | 161 | 62 | 21 | 4.7 |

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