Δημογραφία της Σοβιετικής Ένωσης

Σύμφωνα με δεδομένα της σοβιετικής απογραφής του 1989, ο πληθυσμός της Σοβιετικής Ένωσης αποτελούταν κυρίως από Ανατολικούς Σλάβους (70%), Τουρκικά φύλα (12%) και άλλες εθνικές ομάδες (λιγότερο από 10%). Η πλειοψηφία του πληθυσμού ήταν άθεοι (60%), αλλά υπήρχαν μεγάλες μειονότητες Ρώσων Ορθόδοξων Χριστιανών (περίπου 20%) και Μουσουλμάνων (περίπου 15%).

Life expectancy and infant mortality

After the October revolution, the life expectancy for all age groups went up. A newborn child in 1926-27 had a life expectancy of 44.4 years, up from 32.3 years thirty years before. In 1958-59 the life expectancy for newborns went up to 68.6 years. This improvement was seen in itself by some as immediate proof that the socialist system was superior to the capitalist system. The life expectancy in Soviet Union were fairly stable during most years, although in the 1970s went slightly down probably because of alcohol abuse.
The improvement in infant mortality leveled out eventually, and after a while infant mortality began to rise. After 1974 the government stopped publishing statistics on this. This trend can be partly explained by the number of pregnancies went drastically up in the Asian part of the country where infant mortality was highest, while the number of pregnancies was markedly down in the more developed European part of the Soviet Union. For example, the number of births per citizens of Tajikistan went up from 1.92 in 1958-59 to 2.91 in 1979-80, while the number in Latvia was down to 1.91 in 1979-80.

Population dynamics in the 1970s and 1980s

The crude birth rate in the Soviet Union throughout its history had been decreasing - from 44.0 per thousand in 1926 to 18.0 in 1974, mostly due to urbanization and rising average age of marriages. The crude death rate had been gradually decreasing as well - from 23.7 per thousand in 1926 to 8.7 in 1974.  While death rates did not differ greatly across regions of the Soviet Union through much of Soviet history, birth rates in southern republics of Transcaucasia and Central Asia were much higher than those in the northern parts of the Soviet Union, and in some cases even increased in the post-World War II period. This was partly due to slower rates of urbanization and traditionally early marriages in southern republics.
As a result, mainly of differential birthrates, with most of the European nationalities moving toward sub-replacement fertility and the Central Asian and other nationalities of southern republics having well-above replacement-level fertility, the percentage who were Russians was gradually being reduced.  According to some Western scenarios of the 1990s, if the Soviet Union had stayed together it is likely that Russians would have lost their majority status in the 2000s (decade).  This differential could not be offset by assimilation of non-Russians by Russians, in part because the nationalities of southern republics maintained a distinct ethnic consciousness and were not easily assimilated.
The late 1960s and the 1970s witnessed a dramatic reversal of the path of declining mortality in the Soviet Union, and was especially notable among men in working ages, and also especially in Russia and other predominantly Slavic areas of the country. While not unique to the Soviet Union (Hungary in particular showed a pattern that was similar to Russia), this male mortality increase, accompanied by a noticeable increase in infant mortality rates in the early 1970s, drew the attention of Western demographers and Sovietologists at the time.
An analysis of the official data from the late 1980s showed that after worsening in the late 1970s and the early 1980s, the situation for adult mortality began to improve again.  Referring to data for the two decades ending in 1989-1990, while noting some abatement in adult mortality rates in the Soviet republics in the 1980s, Ward Kingkade and Eduardo Arriaga characterized this situation as follows:  "All of the former Soviet countries have followed the universal tendency for mortality to decline as infectious diseases are brought under control while death rates from degenerative diseases rise. What is exceptional in the former Soviet countries and some of their East European neighbors is that a subsequent increase in mortality from causes other than infectious disease has brought about overall rises in mortality from all causes combined. Another distinctive characteristic of the former Soviet case is the presence of unusually high levels of mortality from accidents and other external causes, which are typically associated with alcoholism."
The rising infant mortality rates in the Soviet Union in the 1970s became the subject of much discussion and debate among Western demographers. The infant mortality rate (IMR) had increased from 24.7 in 1970 to 27.9 in 1974. Some researchers regarded the rise in infant mortality as largely real, a consequence of worsening health conditions and services. Others regarded it as largely an artifact of improved reporting of infant deaths, and found the increases to be concentrated in the Central Asian republics where improvement in coverage and reporting of births and deaths might well have the greatest effect on increasing the published rates.
The rising reported adult mortality and infant mortality was not explained or defended by Soviet officials at the time. Instead, they simply stopped publishing all mortality statistics for ten years. Soviet demographers and health specialists remained silent about the mortality increases until the late 1980s when the publication of mortality data resumed and researchers could delve into the real and artifactual aspects of the reported mortality increases.  When these researchers began to report their findings, they accepted the increases in adult male mortality as real and focused their research on explaining its causes and finding solutions. In contrast, investigations of the rise in reported infant mortality concluded that while the reported increases in the IMR were largely an artifact of improved reporting of infant deaths in the Central Asian republics, the actual levels in this region were much higher than had yet been reported officially. In this sense the reported rise in infant mortality in the Soviet Union as a whole was an artifact of improved statistical reporting, but reflected the reality of a much higher actual infant mortality level than had previously been recognized in official statistics.
As the detailed data series that was ultimately published in the late 1980s showed, the reported IMR for the Soviet Union as a whole increased from 24.7 in 1970 to a peak of 31.4 in 1976.  After that the IMR gradually decreased and by 1989 it had fallen to 22.7, which was lower than had been reported in any previous year (though close to the figure of 22.9 in 1971).  In 1989, the IMR ranged from a low of 11.1 in the Latvian SSR to a high of 54.7 in the Turkmen SSR.
Research conducted subsequent to the dissolution of the Soviet Union revealed that the originally reported mortality rates very substantially underestimated the actual rates, especially for infant mortality. This has been shown for Transcaucasian and Central Asian republics.