1484 International Journal of Epidemiology, 2015, Vol. 44, No. 5 International Journal of Epidemiology, 2015, 1484–1490 Commentary: William doi: 10.1093/ije/dyv288 Advance Access Publication Date: 27 November 2015 Ogburn, Dorothy Thomas and the influence of recessions and expansions on mortality José A Tapia Granados Department of Politics, Drexel University, 3141 Chestnut St., 3021E MacAlister Hall, Philadelphia, PA 19104, USA. E-mail: [email protected] Introduction In 1922 William F. Ogburn, a renowned sociologist at Columbia University, and Dorothy S. Thomas, a 23-yearold graduate student, authored a paper on the influence of macroeconomic fluctuations on social conditions.1 In the paper, the authors noted that changes in the economic system are accompanied by profound social changes. Thus, the industrial revolution of the past century brought changes in political organization, in the family, the position of women ( … ). Such effects are the materials back of the theory of the economic interpretation of history. There is, however, another type of economic change which also occasions social modifications. These changes are ( … ) oscillatory changes of short duration, ( … ) brief swings in economic conditions through prosperity and depression ( … ). These fluctuations in business conditions occur over short intervals with some regularity and are usually referred to as business cycles. Do these fluctuations in business produce fluctuations in social conditions? Do we find relatively more births, deaths, marriages and divorces in periods of business depression? To answer these questions, Ogburn and Thomas constructed an index of economic conditions in the USA for 1870–1920 and correlated it with the rates of marriage, divorce, death and birth. To avoid spurious correlations, they de-trended the correlated series by a variety of ad hoc methods described in the paper. Considering the value and statistical significance of the correlations, they concluded that during periods of business prosperity—that is, during economic expansions—there are relatively more births, marriages and divorces, but also more deaths than in periods of business depression—that is, recessions. The relative increase in births, marriages and divorces during years of prosperity and their decrease in recessions had been reported by other investigators, and Ogburn and Thomas thought it consistent with the fact that couples tend to postpone their marriages, their break-up and their reproduction when economic circumstances are harsh. But to the authors’ surprise, de-trended rates of total mortality, infant mortality and pulmonary tuberculosis mortality correlated positively with the index of business conditions (with correlation coefficients of 0.57, 0.42 and 0.32, respectively); so that these three mortality rates showed, Ogburn and Thomas said, ‘the strange result of increasing in prosperity and decreasing in depression’. Suicides correlated negatively (-0.74) with the business cycle, oscillating as Ogburn and Thomas expected they should, that is increasing during recession and decreasing during prosperity. Table 1 shows that Ogburn and Thomas’s results for the years 1870–1920 are robust to variation in method of detrending and economic indicator used. Puzzled by their results showing that economic prosperity was associated with rising mortality, Ogburn and Thomas tried to ascertain whether other investigators had found the same or if they could replicate the finding with a different country. They were unable to find ‘any published results of correlations by other investigators of death rates and business conditions’. But they examined the correlations of an index of economic conditions—a not very good one, foreign trade—with mortality in England and Wales. Foreign trade correlated 0.02 with general mortality rate and 0.09 with infant mortality, so they concluded that these null correlations supported a sceptical view regarding ‘the existence of a significant correlation between death rates and the business cycle’. Dorothy Thomas continued her academic work on the same issues and, in her PhD dissertation at the London School of Economics, she re-examined the US data and reanalysed British data on mortality with better indicators of the business cycle. Now she found a connection between periods of prosperity and increasing deaths in both countries. She conjectured again that this connection C The Author 2015; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association V International Journal of Epidemiology, 2015, Vol. 44, No. 5 1485 Table 1. Correlations of two business cycle indicators—the unemployment rate and the business cycle index built by Ogburn and Thomas1—with the general mortality rate, infant mortality, tuberculosis mortality and suicides Death rate Infant mortality rate TB death rate Suicide rate Panel A Unemployment rate 0.32† Business cycle indicator 0.31* 0.22 0.15 0.25 0.19 0.63** 0.55* Mortality series and the unemployment rate are in first differences, correlated with the business cycle index which is already de-trended Panel B Unemployment rate 0.46** Business cycle indicator 0.50*** 0.37* 0.37** 0.12 0.23 0.72*** 0.79*** All variables except the business cycle index in deviation from a Hodrick–Prescott trend (c ¼ 100) 0.74 Ogburn and Thomas’s results:a Series de-trended as indicated by Ogburn and Thomas Series de-trended with a 9-year moving average Panel C Business cycle indicator Business cycle indicator 0.57 0.63 0.42 0.37 0.32 Unemployment rates taken from Romer78 (Series UA, Table 9, 1890–900) and from Carter79 (1901–20). a Ogburn and Thomas provided standard errors (not P-values) for the correlations they computed. Considering the standard errors of the Pearson correlation r pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi [which are easily computable with the formula ð1 r2 Þ=ðn 2Þ], the six correlations of panel C are statistically significant at the standard levels of confidence. † P < 0.1; *P < 0.05; **P < 0.01; ***P < 0.001. Data for the years 1870–920 (n ¼ 51) in selected states of the USA, except for suicides which are only for 1900–20 (n ¼ 21) for 100 US cities. In panels A and B, modern methods for de-trending are applied to the series used by Ogburn and Thomas or the unemployment rate as business cycle indicator. Results are very similar (obviously with opposite sign when using the unemployment rate) to those in Panel C obtained by Ogburn and Thomas. is contrary to expectation. Deaths, both in the USA and England, show a strong tendency to increase with prosperity and diminish with depression ( … ) so, although it is difficult to find a satisfactory explanation of the cause of this phenomenon, the conclusion must be drawn that, in both England and the USA, a high death rate is associated with periods of prosperity and a low death rate with periods of depression.2 Thomas became a prestigious scholar—a theorem and an esteemed award in demography now bear her name— but her 1927 findings on the relation between mortality and the business cycle were ignored for half a century. In 1929 the Great Depression started and mortality did not increase, it dropped. Economic turbulence and war followed for almost two decades, then for a quarter-century the Western world experienced rapid economic growth that was supposedly overcoming all social ailments. Mortality rates were showing a long-term decline (the pattern discovered by Thomas referred to short-term oscillations), so any suggestion of harmful consequences for health of economic expansions would have gone much against the grain of the times. Even Dorothy Thomas seems to have been happy with her discovery being forgotten, as she apparently never mentioned it again. Old Controversies In 1977, the year in which Dorothy Tomas died, a biologist at the University of Pennsylvania, Joe Eyer, examined the relation between mortality rates and conditions of the US economy for the years 1875–1975. Eyer’s analysis was simple and straightforward: he noticed that peaks in the unemployment rate coincided with troughs of mortality, and troughs of unemployment coincided with peaks of mortality.3 Eyer named this ‘Thomas effect,’ as unemployment is at its lowest levels in expansions, and at its highest level when the economy is depressed, thus he had found the same pattern that Dorothy Thomas had described in 1927. But Eyer went beyond just the replication of results and proposed explanations: he thought that increased mortality in expansions might result from higher levels of stress at work, declines in networks of social support, and increasing overwork, overtime, migration and consumption of harmful substances associated with business prosperity. That was indeed quite at odds with the prevalent view that social ills result mostly if not exclusively from low income, economic stagnation and lack of work, rather than from overwork or overconsumption. On the other hand, researchers had started to notice that unemployed individuals often have bad health. If that is the case, why it should be that mortality would increase when less people are unemployed? Looking at similar data, Harvey Brenner proposed different explanations. For Brenner, recessions raise mortality by increasing joblessness, reducing incomes and raising social stress.4–7 Brenner argued that the correlation between expansions and higher mortality results from the lagged effects of earlier recessions. Unemployment and business failures ‘are typically associated with increases in mortality two to three years following the lowest point in the business cycle 1486 and extending for at least the next 10 to 15 years’.8 Furthermore, because on average business cycles tend to be 4–5 years in length ( … ), this classic 2–3-year lag in mortality after the peak in the unemployment rate means that the first peak in mortality following recession approximately coincides with the subsequent peak in the business cycle—that is, the peak of ‘recovery’ or ‘expansion’. Given this observation, one should also note that the zero lag relationship between unemployment and mortality rates is actually inverse. The first peak in the lagged mortality rate at 2–3 years after recession is not accidental: the delayed impact of economic distress interacts with chronic disease mortality in such a way that the first wave of increased mortality peaks at about the same time as growth in the economic cycle.8 Brenner also claimed that recession ‘as measured by the unemployment rate, and/or by the business failure rate ( . . . ) is positively related to mortality over 0–10 and 1–7 years, respectively’, though during the recession itself ‘overall mortality declines, followed by a sharp increase (with no lag) during the initial year of recovery.’8 In summary, what Brenner claimed—in a not very transparent way—is that peaks in mortality actually coincide with expansions, not with recessions, because recessions cause an increase in mortality with a lag. But how long is that lag? Brenner gave a variety of answers to this question, as the cited passages show. It is well established in economics, though, that the business ‘cycle’ is actually irregular; some ‘cycles’ of expansion and recession last 1 or 2 years, whereas other cycles last several years, or even a decade. The mechanism suggested by Brenner to explain why peaks of mortality coincide with troughs in unemployment, i.e. with expansions, is problematic for this reason. Brenner’s studies were criticized for a number of reasons, including the methods used and the lack of sufficient information about both data and methods.9–15 Authors trying to replicate Brenner’s results were unable to reproduce them. Specific attempts to find a lagged effect of recessions on population mortality were unsuccessful.16–18 Two epidemiologists summarized the criticisms received by Brenner’s investigations by stating that they had led to considerable scepticism about the data and the conclusions.19 An economist who meticulously reviewed the literature concluded that a number of investigators had pointed out ‘serious technical flaws in Brenner’s methods’.20 Unfortunately, the controversies on Eyer’s and Brenner’s work generated such a confusion that, during the last two decades of the past century, for many social researchers it was difficult even to understand the different views that were at play. International Journal of Epidemiology, 2015, Vol. 44, No. 5 New Methods Things started to change in 2000, when a leading journal in economics published an article in which Christopher Ruhm showed that mortality for major causes of death increased in expansions and declined in recessions.16 Ruhm used an innovative but straightforward technique—panel regression with fixed effects—applied to 1972–91 data of the 50 states of the USA. Ruhm did not know at the time of the old publications by Ogburn, Thomas and Eyer, so he did not cite them. But he found, like Ogburn, Thomas and Eyer before him, that suicides oscillate contrary to total mortality, i.e. rising in recessions and falling in expansions. Economists use the term ‘procyclical’ to describe variables like employment or use of energy which increase in expansions and decrease in recessions, and the term ‘countercyclical’ for variables like unemployment or business failures that rise in recessions and fall in expansions. Thus in economic terminology what Ogburn and Thomas had discovered in the 1920s was a procyclical oscillation of mortality rates and a countercyclical oscillation of suicide rates in US and British data. The same pattern was rediscovered by Joe Eyer for the period 1875–1975 in the USA. Ruhm found it again in data for the 50 US states in 1972–91. Ruhm’s paper was considered a ground-breaking investigation, and in the following years other papers replicated Ruhm’s findings with a variety of data and countries in Europe, Latin America and Asia.17,21–36 In 2005, I submitted to this journal a paper showing that, during the 20th century in the USA, the long-term decline of total mortality and mortality for specific population groups, ages and causes of death accelerated during recessions and was reduced or even reversed during periods of economic expansion (the exception being suicides, which increased in recessions). It was a further replication of the Thomas effect. The editor decided to publish the paper with some critical commentaries and my response.37–44 Almost a century has now passed since the publication of the seminal contributions by Ogburn and Thomas1,2 and many investigations17,21–36,45–48 have replicated the basic findings of these authors. In my view the Thomas effect, the procyclical oscillation of mortality, is one of a relatively small set of regularities solidly demonstrated in social science. Christopher Ruhm has been a key author in the demonstration of that regularity,16,20,49–54 discovered almost a century ago by Ogburn and Thomas. New Controversies Any regularity observed in the past allows us to form expectations about the future. If the Thomas effect is correct, International Journal of Epidemiology, 2015, Vol. 44, No. 5 then we can expect mortality to fall in recessions and rise in expansions, just as we expect high blood pressure in obese individuals, cancer and early death in smokers, or rising wages when the economy booms. But, of course, that wages are procyclical has been disputed for decades in economics; and the Thomas effect, the procyclical oscillation of mortality, has been also disputed by a number of authors. Ralph Catalano is one author who has disagreed with the idea that we should expect above-trend mortality during expansions and below-trend mortality during recessions. In a recent review of the health effects of economic decline—which did not even mention the contributions of Ogburn and Thomas and ignored many other peerreviewed publications on these issues—Catalano et al. concluded55 that no definite association of total mortality, cardiovascular disease mortality or infant mortality with macroeconomic fluctuations has been proved. The proposition that during the expansions of the US economy increasing mortality is observed37 was also disputed by Catalano40 as representing an ecological fallacy.56 Catalano theorized a long time ago on the use of time series in epidemiology (his views57 can be compared for instance with those of Zeger et al.58). In a practical application of his methodology, Catalano included Danish economic data as covariates in regressions to model US mortality.59 With this methodology, Catalano concluded that whereas recessions have no effect on death rates, expansions are associated with drops in mortality 1 year later. He argued that this association was attributable to the fact that extra governmental resources during the upturn would allow for the expansion of health care to persons ‘not thought to be at sufficient risk to warrant attention at an earlier budget period’.59 David Stuckler and Sanjay Basu have also disagreed with the idea that general mortality has a procyclical oscillation. Stuckler, Basu and coauthors argue that economic crises increase suicides and decrease traffic injuries, but they may or may not raise mortality due to other causes of death depending on the policies that governments apply to deal with the crisis.60–63 Using data on ‘economic crises’ in 1970–2007 and mortality in 26 European countries, Stuckler et al. found that increases in unemployment were associated with an increase in suicides and a decrease in traffic mortality, but they did not find any evidence that all-cause mortality was affected by recessions.60 This is in contrast to other investigations using data from European countries, showing that recessions are associated to declines in mortality.21–23,29,50 The discrepancy may be perhaps explained by the fact that Stuckler et al.60 included as economic crises in the investigated sample not only recessions in market economies of Western Europe, but also the transition crisis of the early 1990s in Eastern Europe, when 1487 the sudden transformation of centrally planned economies into a market economy was associated with major upturns in mortality rates. The combination of increases in mortality associated with rising unemployment during the transition in the East and decreases in mortality associated with business-cycle recessions in the West, may well result in no association overall. Stuckler has also claimed that banking crises significantly increase heart disease mortality.64 But banking crises and recessions are systematically linked, so Stuckler’s results are at odds with research by Ruhm and others who have shown reduced rates of cardiovascular mortality and ischaemic heart disease mortality during recessions in a variety of countries.23,24,33,52 A case that illustrates the disputes on the Thomas effect was a paper by Tapia and Diez Roux, in which we showed significant declines in mortality due to major causes of death during the recessions of the period 1920–40, including the Great Depression of the early 1930s.26 Stuckler et al.65 disputed our major conclusions and a controversy followed.66–68 Catalano et al. also disputed the view that the Great Depression had been associated with significant drops in mortality.69 In both cases, critics argued that there is no evidence that oscillations of general mortality in the early 1930s had anything to do with the Great Depression. The health consequences of the recent Great Recession have also triggered controversy. Given the deterioration of living standards and social services during the crisis, many were expecting an increase of mortality rates. However, excepting a moderate increase in suicides, no significant increase in general mortality has been detected anywhere. Indeed in the European Union, evidence shows that— consistent with the Thomas effect—national mortality rates for all deaths and major causes of death have evolved better during the recession than in previous years.33,70–72 Research has abundantly demonstrated that in the long run economic growth is linked to declines in mortality. However, all evidence suggests that this link has been weakened with the passage of time. Thus cross-country data from recent decades ‘show almost no relation between changes in life expectancy and economic growth over 10, 20, or 40year time periods between 1960 and 2000. Many countries have shown remarkable improvements in health with little or no economic growth’;73 but the controversial Thomas effect is quite different: it is a regularity in the relation between mortality and economic growth in the short run. In my view—which of course is the view of an interested party in the controversies—there is strong evidence for the Thomas effect in recent business cycles in a variety of countries,25,31,33,34,36,70 though data also show that the link between business cycles and mortality probably has weakened in recent decades.18,24,54 Ruhm54 has asserted that total 1488 mortality in the USA has shifted since the 1970s from being strongly procyclical to being essentially unrelated to the condition of the economy, but the relationship is likely to be poorly measured when using less than 15- or 20-year periods. Ruhm claims that some countercyclical patterns have emerged, for instance deaths caused by overdose of prescription drugs, which rose dramatically in recent recessions. Based on an analysis of US data for smaller areas (counties rather than states), Lindo36 has disagreed with Ruhm’s view that death rates have become less procyclical in recent years. Some support for Lindo’s view is given by the evolution of mortality for all causes in the USA in the period 1990–2013. Using age-adjusted mortality (computed with the 2000 population as standard) to eliminate the effect of ageing, total mortality in the period decreased on average by 1.1% per year, but in these 24 years there were only three in which age-adjusted mortality increased. They were 1993, 1999 and 2005, when age-adjusted mortality grew by 2.3%, 0.6% and 0.2%, respectively. But alas! these three were years of expansion, not recession. Final Remarks Results of investigations on social issues are often disputed by investigators who disagree about results on the ground of appropriateness of data or methods.29,52,67,74–76 When confronting results showing the Thomas effect, one major concern of many social researchers is that results showing that recessions are good for health seem to be inconsistent with studies at the level of individuals, which strongly suggest that being unemployed is bad for health.77 A recent paper using individual data from the Panel Study of Income Dynamics32 has provided evidence that joblessness strongly raises the risk of death among those suffering it, but also that recessions are associated with a moderate but significant reduction in the risk of death among the entire population. Both effects are not inconsistent. Clarity of the analysis is a major value of compelling social research. The 1922 article, in which Ogburn and Thomas discovered the procyclical oscillation of mortality, is an excellent example of simplicity and transparency. Ogburn and Thomas were seminal authors in what today it could be very well called economic epidemiology. The decision of the International Journal of Epidemiology to reprint Ogburn and Thomas’s article is to be commended. In addition to its historical value, the paper will be an excellent introduction to the topic of the links between economic recessions and health, an area of enquiry in which confusion and obscurity—two characteristics that good science always aims to eliminate—are quite abundant. International Journal of Epidemiology, 2015, Vol. 44, No. 5 Conflict of interest: None declared. References 1. Ogburn WF, Thomas DS. The influence of the business cycle on certain social conditions. J Am Stat Assoc 1922;18:324–40, pp. 150–59. 2. Thomas DS. Social Aspects of the Business Cycle. New York, NY: Knopf, 1927, pp. 150–59. 3. 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Spurious volatility in historical unemployment data. J Polit Econ 1986;94:36. 79. Carter SB, Gartner SS, Haines MR, Olmstead AL, Sutch R, Wright G. Historical Statistics of the United States: Millennial Edition Online. New York, NY: Cambridge University Press, 2006. International Journal of Epidemiology, 2015, 1490–1492 Commentary: doi: 10.1093/ije/dyv289 Advance Access Publication Date: 27 November 2015 Macroeconomic conditions and social outcomes through a 90-year lens Christopher J Ruhm Frank Batten School of Leadership and Public Policy, University of Virginia, Charlottesville, VA 229044893, USA. E-mail: [email protected] Accepted 1 October 2015 Published over 90 years ago, ‘The Influence of the Business Cycle on Certain Social Conditions’ by William Ogburn and Dorothy Thomas1 (hereafter ‘OT’) stands the test of time with results that are sometimes expected and occasionally surprising. OT use US data from 1870–1920 to examine the relationship between business cycle fluctuations and marriage, divorce, fertility, crime, total mortality, infant deaths, tuberculosis fatalities and suicides. My first impression, upon rereading this paper, was to be reminded of the great effort involved to create the dependent and explanatory variables. Modern researchers can easily ascertain dates and other aspects of business cycle conditions from the National Bureau of Economic Research [www.nber.org/cycles. html], information on mortality, fertility, marriage and divorce from the National Center for Health Statistics [http://www.cdc.gov/nchs/nvss.htm] and crime data from the Federal Bureau of Investigation [https://www.fbi.gov/ stats-services/crimestats] or Bureau of Justice Statistics [http://www.bjs.gov]. By contrast, OT had to painstakingly construct each statistic from original sources, often requiring difficult design decisions amid imperfect and incomplete information. For instance, their main business cycle measure was an arithmetic mean of nine components capturing aspects of economic performance related to prices, business failures, production, railroad mileage, employment and international trade. Presaging modern macroeconomic techniques, each component was transformed into standard deviations around the trend-adjusted mean, and the final overall business cycle variable was then compared with plausible alternatives. Similar effort went into measuring the outcomes, often with information available for only a portion of the full analysis period. C The Author 2015; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association V
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