A 2007 study done by Baruch College economists June and David O"Neill sheds some light on why U.S. infant mortality rates are higher—more low weight births. In their study, U.S. infant mortality was 6.8 per 1,000 live births, and Canada's was 5.3. Low birth weight significantly increases an infant's chance of dying. Teen mothers are much more likely to bear low birth weight babies and teen motherhood is almost three times higher in the U.S. than it is in Canada. The authors calculate that if Canada had the same the distribution of low-weight births as the U.S., its infant mortality rate would rise above the U.S. rate of 6.8 per 1,000 live births to 7.06. On the other hand, if the U.S. had Canada's distribution of low-weight births, its infant mortality rate would fall to 5.4. In other words, the American health care system is much better than Canada's at saving low birth weight babies —we just have more babies who are likely to die before their first birthdays.
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But infant mortality tells us a lot less about a health care system than one might think. The main problem is inconsistent measurement across nations. The United Nations Statistics Division, which collects data on infant mortality, stipulates that an infant, once it is removed from its mother and then "breathes or shows any other evidence of life such as beating of the heart, pulsation of the umbilical cord, or definite movement of voluntary muscles... is considered live-born regardless of gestational age."16 While the U.S. follows that definition, many other nations do not. Demographer Nicholas Eberstadt notes that in Switzerland "an infant must be at least 30 centimeters long at birth to be counted as living."17 This excludes many of the most vulnerable infants from Switzerland's infant mortality measure.
Switzerland is far from the only nation to have peculiarities in its measure. Italy has at least three different definitions for infant deaths in different regions of the nation.18 The United Nations Statistics Division notes many other differences.19 Japan counts only births to Japanese nationals living in Japan, not abroad. Finland, France and Norway, by contrast, do count births to nationals living outside of the country. Belgium includes births to its armed forces living outside Belgium but not births to foreign armed forces living in Belgium. Finally, Canada counts births to Canadians living in the U.S., but not Americans living in Canada. In short, many nations count births that are in no way an indication of the efficacy of their own health care systems.
The United Nations Statistics Division explains another factor hampering consistent measurement across nations:
...some infant deaths are tabulated by date of registration and not by date of occurrence... Whenever the lag between the date of occurrence and date of registration is prolonged and therefore, a large proportion of the infant-death registrations are delayed, infant-death statistics for any given year may be seriously affected.20
The nations of Australia, Ireland and New Zealand fall into this category.
Registration problems hamper accurate collection of data on infant mortality in another way. Looking at data from 1984-1985, Eberstadt argued that, "Underregistration of infant deaths may also be indicated by the proportion of infant deaths reported for the first twenty-four hours after birth."21 Eberstadt found that in the U.S. and Canada more than a third of all infant death occurred during the first day, but in Sweden and France they accounted for less than one-fifth. Table 3 shows that the pattern still holds today.
Inconsistent measurement explains only part of the difference between the U.S. and the rest of the world. Were measurements to be standardized, according to Eberstadt, "America might move from the bottom third toward the middle, but it would be unlikely to advance into the top half."22 Another factor affecting infant mortality Eberstadt identifies is parental behavior.23 Pregnant women in other countries are more likely to either be married or living with a partner. Pregnant women in such households are more likely to receive prenatal care than pregnant women living on their own. In the U.S., pregnant women are far more likely to be living alone. Although the nature of the relationship is still unclear (it is possible that mothers living on their own are less likely to want to be pregnant), it likely leads to a higher rate of infant mortality in the U.S.
In summary, infant mortality is measured far too inconsistently to make cross-national comparisons useful. Thus, just like life expectancy, infant mortality is not a reliable measure of the relative merits of health care systems.
Conclusion
Life expectancy and infant mortality are wholly inadequate comparative measures for health care systems. Life expectancy is influenced by a host of factors other than a health care system, while infant mortality is measured inconsistently across nations. Neither of these measures provides the United States with conclusive guidance on health care policy, let alone serve as reliable evidence that a system of universal health care "should be implemented in the United States."24
Life expectancy rates also depend on personal habits such as smoking, diet, and physical activity. Interestingly, U.S. smoking rates are lower (17 percent of adults) than for many developed countries with higher life expectancies. For instance, 30 percent of Japanese adults smoke daily. In France, 23 percent of adults smoke; Germany, 25 percent; Switzerland, 25 percent; Spain, 28 percent, and the U.K., 25 percent.
The fact that Americans tend to be a lot fatter than the citizens of other rich developed countries increases their risks of heart disease and diabetes. A recent international survey reported that 31 percent of Americans are obese (body mass index over 30), whereas only 23 percent of Britons, 21 percent of Australians and New Zealanders, 14 percent of Canadians, 13 percent of Germans, 9 percent of the French, and 3 percent of Japanese have body mass index measurements over 30.
Taking all these unhealthy proclivities into consideration, the American health care system is most likely not to blame for our lower life expectancies. Instead, American health care is rescuing enough of us from the consequences of our bad health habits to keep our ranking from being even lower.
According to the way statistics are calculated in Canada, Germany, and Austria, a premature baby weighing <500g is not considered a living child.
But in the U.S., such very low birth weight babies are considered live births. The mortality rate of such babies — considered “unsalvageable” outside of the U.S. and therefore never alive — is extraordinarily high; up to 869 per 1,000 in the first month of life alone. This skews U.S. infant mortality statistics."