Global Population Pyramids

The Lancet has but published a recent fix of papers from the Global Burden of Disease Study. As it notes: "The Global Burden of Disease Study (GBD) is the most comprehensive worldwide observational epidemiological written report to date. It describes mortality together with morbidity from major diseases, injuries together with lead a opportunity factors to wellness at global, national together with regional levels. Examining trends from 1990 to the acquaint together with making comparisons across populations enables agreement of the changing wellness challenges facing people across the footing inwards the 21st century."

Interested readers volition detect lots to chew on inwards these papers. Here, I'll stick to a figure showing "global population pyramids" from the article "Population together with fertility past times historic menses together with sexual practice for 195 countries andterritories, 1950–2017: a systematic analysis for the Global Burden of Disease Study 2017," authored past times the GBD 2017 Population together with Fertility Collaborators (Lancet, published Nov 10, 2018; 392: 10159, pp. 1995–2051).



The iv panels demonstrate iv years: 1950, 1975, 2000, together with 2017. The crimson bars demonstrate size of woman soul population at dissimilar historic menses groups, from younger ages at the bottom to older ages at the top; the yellowish bars create the same for men. Horizontal lines demonstrate the average together with median historic menses for men together with women inwards each year.

H5N1 few thoughts:

1) These population pyramids are peculiarly useful for looking at the development of the historic menses distribution. "In 1950, the global mean  age of a soul was 26·6 years, decreasing to 26·0 years in 1975, together with therefore increasing to 29·0 years inwards 2000 and 32·1 years inwards 2017.

2) The bulge inwards the working historic menses population inwards 2000 together with 2017, equally opposed to the before years, is apparent. " Demographic modify has economic consequences, together with the proportion of the population that is of working historic menses (15–64 years) decreased from 59·9% in 1950 to 57·1% inwards 1975, together with therefore increased to 62·9% inwards 2000 and 65·3% inwards 2017."

3) Over time, the population pyramids has conk relatively broader at the bottom; that is, they create non taper equally speedily equally i moves to older aged. That blueprint tells y'all that the elderly are a rising part of the population. It likewise suggests that equally today's younger generations age, together with their issue rising upwards through the global population pyramid, the part of the elderly inwards the footing population volition rising substantially.

4) The increasing expanse of the pyramids shows the rising inwards global population since 1950. Less clear to the naked oculus is that the charge per unit of measurement of growth inwards the world  population has shifted from beingness exponential to beingness linear. 

"From 1950 to 1980, the global population increased exponentially at an annualised charge per unit of measurement of 1·9% ... . From 1981 to 2017, however, the stride of the global population increment has been largely linear, increasing by  83·6 meg people per year. ... Growth of the global population increased inwards the 1950s together with reached 2·0% per twelvemonth inwards 1964, together with therefore slow decreased to 1·1% inwards 2017." 

5) Although geographic breakdowns aren't shown inwards this figure, the regional patterns of population growth convey likewise differed substantially. 

"In 1950, the high-income, fundamental Europe, eastern Europe, together with fundamental Asia GBD super-regions accounted for 35·2% of the global population but, inwards 2017, the populations of these countries accounted for 19·5% of the global population. Large increases occurred inwards the proportion of the world’s population living inwards southward Asia, sub-Saharan Africa, Latin America together with the Caribbean, together with N Africa together with the Middle East. ...  Growth of the population inwards N Africa together with the Middle East increased until the 1970s, together with it has remained quite high, at 1·7% inwards 2017. Population growth rates inwards sub-Saharan Africa increased from 1950 to 1985, decreased during 1985–1993, increased i time to a greater extent than until 1997, together with and therefore plateaued; at 2·7% inwards 2017, population growth rates were nigh the highest rates e'er recorded inwards this region. The most substantial changes to population growth rates were inwards the southeast Asia, eastward Asia, together with Oceania super-region, where the population growth rate decreased from 2·5% inwards 1963 to 0·7% inwards 2017. ... In fundamental Europe, eastern Europe, together with fundamental Asia, the population growth charge per unit of measurement dropped rapidly afterward 1987 together with was negative from 1993 to 2008. Growth rates inwards the high-income super-region convey changed the least, starting at 1·2% inwards 1950 together with reaching 0·4% inwards 2017."