Global Journal of Science Frontier Research, H: Environment & Earth Science, Volume 22 Issue 1

Another odd is increase in the life year losses due to non - communicable diseases (NCD). This is evident from figure 2.2. The average Life expectancy data of world population for several years is plotted and presented in Fig 2.3. The trend line is also shown. The statistical model with parameters is shown. Statistical model is Life Expectancy (years) = 0.3205 * years – 573.23 R 2 = 0.9671; time period 960 – 2016. However the average life expectancy is consistently increasing. Every year, 0.3205 year is increasing in the world population life expectancy on average. This means every three years, one year life expectancy is increasing on the average life expectancy of the world population meaning 4 months in every year. See Fig. 2.3 Since the world countries are much heterogeneous in characters, there are also variations in the life expectancies between different countries, regions and level of economic development. In the table and figure here the variations in life expectancy based on the World Bank Income Groups are depicted. See the Table 2.4 and Fig. 2.4. Table 2.4: Life Expectancy by World Bank Income Group Sl no. WB Income Group Life Expectancy (years) 2020 1 High Income 81.84 2 World 74.18 3 Middle income 74.28 4 Low & Middle income 73.13 05 Lower Middle income 70.21 6 Low Income 63.43 y = 13 . 53 x - 25870 R² = 0.979 0 500 1000 1500 2000 1980 1990 2000 2010 2020 Total NCD (million DALYs) Total Linear (Total) y = 0 . 320 x - 573 . 2 R² = 0.967 0 10 20 30 40 50 60 70 80 1940 1960 1980 2000 2020 World Population Life Expectancy (Years) World Linear (World) © 2022 Global Journals 1 Year 2022 12 Global Journal of Science Frontier Research Volume XXII Issue ersion I VI ( H ) Global Environmental Pollution and Its Effect on Life Expectancy Fig. 2.2: Trend in the NCD Fig. 2.3: Trend of Life Expectancy of World Population