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Global variations in health and mortality: evaluating the relative income hypothesis (also see video version) training/videos/index.shtml.

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Presentation on theme: "Global variations in health and mortality: evaluating the relative income hypothesis (also see video version) training/videos/index.shtml."— Presentation transcript:

1 Global variations in health and mortality: evaluating the relative income hypothesis (also see video version) training/videos/index.shtml Min-Hua Jen and Kelvyn Jones School of Geographical Sciences LEMMA, University of Bristolvideo version

2 Structure of talk The changing patterns of global life expectancy, ? The relative income hypothesis as an explanation, but the problem of aggregate analysis Evaluating the relative income hypothesis using the World Value Survey: a combined micro and macro analysis

3 Key question: are there groups of countries with a similar underlying and distinctive trajectory? INPUT (simplest possible mode) Y ij Life expectancy for time i in place j T ij Time for occasion i in place j:1970 to 2002 How many latent groups? Fit sequence 1, 2… The order of the polynomial for trends; usually LE 3 OUTPUT Polynomial trends for each group with a distinctive trajectory BIC: a goodness of fit measure, penalized by complexity of model; using here in a highly exploratory mode! Latent group trajectory models

4 One and two group solutions One trajectory Two trajectories

5 Latent trajectory models: global mortality Ten group solution

6 So Far Substantial differences between countries Evidence of growing differences between countries in recent years Strong macro geography eg continuing improvement in W Europe and N America; major improvement in North Africa and the Middle East; stagnation in the western former satellite Soviet states; major decline in the former Soviet Union. In search of an explanation for differences in advanced economies…………The relative income hypothesis

7 Relative income hypothesis Development of the argument by Richard Wilkinson inUnhealthy societies (1996) Mind the gap (2000) Very highly summarised here … 1Income and health: within-country relations Age adjusted mortality of 300k white American men by median family income; marked negative relationship; poor die young

8 Relative income (continued) 2: GNP and health: between-country relations Life expectancy and GNP per capita in OECD countries, 1993 In advanced economies: no relation 3 Income inequality and Health Life expectancy and income distribution in developed countries Most egalitarian: live longer

9 Relative income Summary of the argument In the developed world, it is not the richest countries which have the best health, but the most egalitarian (US, 1996,3) where income is related to social status, as it is within countries, it is also related to health. Where income differences mean little or nothing for peoples position in the social hierarchy (such as those between countries) income makes little difference to health. This strongly implies that psychosocial pathways are important (MTG,2000, 10-11) Income distribution is linked to social cohesion which is turn is linked to mortality (US, 1996,ix)

10 Relative income (continued) Underlying psycho-social model Income inequality Material Circumstances Health Inequality Dominance Hierarchy Gaps in Social Status Anxiety Stress Violence Social Cohesion Social Capital Life Expectancy Societal Structures Psycho-social Pathways Outcomes

11 Simulated non-linear relation between income and mortality Artificial relation between mortality and inequality Multilevel analysis NO between country Variation But: The problem of aggregate analysis

12 Evaluating the Relative income hypothesis Requires micro and macro analysis simultaneously Are there effects for income inequality (macro) after taking account of individual income (micro) Last ten years, dozens of studies have done this with mixed results But none done at the scale at which Wilkinson made the original argument: Countries The World Value Survey…………..have to use self-rated health; no mortality data with individual income exists on a global basis

13 The World Values Survey Response: All in all, how would you describe your state of health these days? (Good, Fair and Poor) with Good as the base. Structure: respondents with 4 waves (1981, 1990, 1995, 2001) in 69 countries. a representative national sample of at least 1,000 people, (not every country is included at each wave) Predictors -Micro: household income, age, sex and marital status -Macro: World Bank country-level income data on GDP per capita (in purchase power parity for 2004 US dollar) on an annual basis; income inequality data comes from UTIP-UNIDO project ( University of Texas) -Modelling : 3- level (170k respondents, 4 waves, 69 countries) multilevel multinomial model fitted in MLwiN

14 The World Values Survey Some results Differences between countries (after taking account of age and sex) 13 fold difference between countries with the most and least poor health (Ukraine versus Switzerland)

15 Effects for Individual variables Differences between countries Individual Income: non- linear dose response

16 Effect of inequality After taking account of individual income Above threshold: Unequal countries have lower odds of reporting poor cf good health! Essentially flat relation for no income group is the relation as posited by Wilkinson

17 Conclusions Substantial differences between countries in self-reported health after taking account of age and sex Individual income has clear effect: poorer people report worse health Income inequality does not have the hypothesized pattern of egalitarian societies reporting better health There remains substantial differences between countries even after taking account of micro and macro variables; in particular the Former Communist report high levels of poor health Problem of data quality…European Household Panel Survey

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