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Transcript of UCD CENTRE FOR ECONOMIC RESEARCH WORKING PAPER SERIES · PDF fileUCD CENTRE FOR ECONOMIC...
UCD CENTRE FOR ECONOMIC RESEARCH
WORKING PAPER SERIES
2010
Height and well-being amongst older Europeans
Kevin Denny, University College Dublin
WP10/36
October 2010
UCD SCHOOL OF ECONOMICS UNIVERSITY COLLEGE DUBLIN
BELFIELD DUBLIN 4
HeightandwellbeingamongstolderEuropeans
KevinDenny
SchoolofEconomics
UniversityCollegeDublinIreland
October20th2010
Thispaperusesacrosscountry representative sampleofEuropeansover the
ageof50 to analysewhether individualsheight is associatedwithhigheror
lower levelsofwellbeing.Twooutcomesareused:ameasureofdepression
symptomsreportedbyindividualsandacategoricalmeasureoflifesatisfaction.
It isshownthatthere isaconcaverelationshipbetweenheightandsymptoms
of depression. These results are sensitive to the inclusion of several sets of
controls reflecting demographics, human capital and health status. While
parsimoniousmodelssuggestthatheight isprotectiveagainstdepression,the
additionofcontrols,particularlyrelatedtohealth,suggeststhereverseeffect:
tallpeoplearepredictedtohaveslightlymoresymptomsofdepression.Height
hasnosignificantassociationwith lifesatisfaction inmodelswithcontrols for
healthandhumancapital.
Keywords:height,depression,wellbeing,lifesatisfaction,health
[email protected] Address: School of Economics, University College Dublin, Dublin 4, Ireland (visitingEconomicsDepartment,UniversityofKentucky2010).Theauthor isalsoaffiliatedtotheUCDGeary InstituteandtheInstituteforFiscalStudies,London.
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1.Introduction
The relationship between height and labourmarket outcomes such as earnings has been
extensivelystudiedbyeconomistsparticularlysince thepublicationofPersicoetal (2004).
Understandingthecauseofthepremiumhasproved lessstraightforward.CaseandPaxson
(2008)attribute it to theassociationbetweenheightandcognitiveability.The idea is that
low height is a marker for underdevelopment generally reflecting, perhaps, early
deprivation.Cognitiveunderdevelopment,theargumentgoes, isoneaspectofthisunder
development.Therehasbeenmuch lessanalysisofwhetherheight isassociatedwithwell
beinggenerally.Thetwoissuesareclearlyrelatedsinceonewouldexpectaheightearnings
premium to translate intohigher levelsofwellbeing. Indeedcognitiveabilitycouldhavea
direct positive independent of any effect via earnings. Lundborg et al (2009) by contrast
presentevidencethatthepremiumisprimarilyduetotheassociationbetweenheightanda
personsphysicalcapacity.Itisworthremembering,asBattyetal(2009)pointout,thatwhile
early lifeconditions(particularly inextremis)maywell influenceheight,there isalsoavery
stronghereditarycomponent.
Amongst health researchers, a number of studies have analysedwhether height predicts
mentalhealth.ForexampleStack&Wasserman(1996)foundthatshorterpeopleweremore
likely to attempt suicidewhile Bjerkeset et al (2008)who find no associationwith either
depression or suicidality. However, some of these studies in this area are primarily
concerned with those who are abnormally short (particularly children) arising from
conditionssuchasgrowthhormonedeficiencyandare lessconcernedwithvariation inthe
normalrange,seeLaw(1987)forareview.
Averyuseful recentoverviewof thepossiblepathwaysbetweenheightandbothphysical
andmentalhealthisprovidedbyBattyetal(2009).Theynotethattherearebothcostsand
benefits to height sowhile chronic heart disease ismore common amongst short people
certaincancersareactuallylesscommon.Thissuggeststhatoneshouldbealerttopossible
nonlinearitieswhen looking at the effect onwellbeing since, conceivably, the effect of
height, to the extent that it is a health effect,may be nonmonotonic. Nonmonotonic
associationswith regard to height have been found in some studies. For exampleNettle
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(2002)looksatthereproductivesuccessofacohortofBritishmalesandfindsthatwhiletall
menaremore likely tohavea long termpartnerand less likely tobe childless than short
men, extremely tallmen have an excess of health problems and aremore likely to be
childless.AnanalogouspatternisfoundbyHbler(2009)whofindsanonmonotonicheight
earnings premium for males with short and very tall men earnings less than those in
between.Heineck(2008)findsasimilarnonmonotonicearningsheightrelationship.
Therehavebeenseveralrecentcontributionstotheeconomics literatureonthesubjectof
height andwellbeing. The paper byDeaton&Arora (2009) uses a largeUS dataset, the
GallupHealthways Wellbeing index. The outcome studied is the Cantril selfanchoring
striving scale (Cantril (1965)) inwhich individuals identifywhere they are on a notional
ladderwiththetop(11th)rungcorrespondingtothebestpossiblelifeandthebottomrung
correspondingtotheworstpossible life.Theyfindthatheight is indeedassociatedwitha
higher place in this index and,moreover that it is almost entirely due to the association
betweenheightandbothearningsandeducation.ThestudybyRees,SabiaandArgys(2009)
foundinasampleofUSadolescentstheexistenceofasmallheightpremium,intheformof
fewersymptomsofdepression.Thiswaspresentonlyforolderfemales(ages1719)butall
males (ages1219).They findnoeffectson selfesteem.Thispaperhas themeritofusing
longitudinal datawhich allows it control for fixed effects though this turns out not to be
critical.
Thispaperaddstothesefindingsanddiffersfromtheminseveralkeyrespects.Itusesalarge
representative sample from12Europeancountrieswhich isdrawn from thepopulationof
over50yearolds.Itconsidersasoutcomesbothameasureoflifesatisfactionandameasure
ofdepressionsymptoms.Italsoallowsfortherelationshipwithheighttobenonlinear.
2.Data
The dataset used is SHARE: the Survey of Ageing,Health and Retirement in Europe. This
collectsdatafromnationallyrepresentativesamplesofthenoninstitutionalpopulationaged
50 years and older. The primary sampling unit is a household and all individuals in the
householdwhoare inthetargetagecategoryare interviewed.Thispaperusedrelease2of
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thedatasetwhich includes12countrieswhichwascollectedbetween2004and2006.See
BoerschSupan&Juerges(2005)fordetailsofthemethodologybehindthedataset.
EuroD is a 12 item scale developed by the EURODEP Consortium (Prince et al 1999,
Copeland1999).Itisprimarilybasedonthreeparentinstruments:theGeriatricMentalState
AGECAT(Copeland,Dewey,&GriffithJones,1986),SHORTCARE(Gurland,Golden,Teresi,&
Challop,1984),andCESD (Radloff,1977).The latter instrument isused in theRees,Sabia
andArgys(2009)paperdiscussedabove.TheEuroDscalewascreatedtoprovideasimple
measure of the extent of depressive symptoms that could be used for comparing across
European countries. The questions refer to the presence of these symptoms in the last
month.Valuesofthescaleequaltothreeorhigheraretakenasadepressioncasethat is
indicatingthatsuchanindividualisatriskofdepression.Hencethescalecannotbeusedto
indicatewhetheran individual isclinicallydepressedornotbut forconvenience, itwillbe
sometimes referred tohereas depression. Forotheranalysesof thedepressiondata in
SHAREseeCastroCostaetal(2007)andDenny(2009).Thequestiononsatisfactionisbased
onresponsestothequestionHowsatisfiedareyouwithyourlifeingeneral?andiscoded
from0(lowest)to3(highest).
Themarginaldistributions for these twovariables for thesampleused in thedataanalysis
areshowninFigures1and2respectively.Thejointdistributionofthetwooutcomesisgiven
inTable1b (where theEuroD scalehasbeen simplified forconvenience).There isaclear
associationbetween the two (thenullof independence is comfortably rejected,p=.0000).
Nonetheless there are individualswith relativelyhighdepression scoreswho reportbeing
very satisfiedwith their life. Since the two refer todifferentperiods this isbynomeans
inconsistentbut it serves to remindone thatone shouldnotassume that findings forone
outcomewillberepeatedfortheother.Theindependentvariableofinterestisthepersons
selfreportedheightmeasured incentimetres. Kerneldensityestimatesforthedistribution
ofheight formalesand femalesareshown inFigure3.There isevidenceofbimodality for
bothsexeswhichseemstoreflectdigitalpreferencewith largenumbersreportingvalues
at160,165,168and170cmrelativetoadjacentvalues.
Allmodelscontainasetofcountrydummyvariables(notshowninthetables)andadummy
variable forbeing female.Controls are classified into three groups,demographics,human
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capitalandhealth.Demographiccontrolsconsistofage(inyears)andasetofdummiesfor
marital status.Human capital controls consistsof income (in/10000),yearsofeducation
andameasureofverbalability.Sinceaconsiderableproportionofthesampleisreportedto
havezeroincome,adummyforzeroincomeisincluded.Thehealthcontrolsconsistsofthe
numberofchronicdiseaseseverexperienced,ameasureofgripstrength,andtwomeasures
of theirphysical infirmity.One iswhether they report limitationsof theiractivitiesby the
IADLcriterion (instrumentalactivitiesofdaily living).Respondentswereaskedaboutseven
activitiesandavariable codedone if they report limitationswithoneormoreof these is
used.Thesecondmeasure,labelledGALI,isabinaryvariableindicatingwhethertheyhave
feltlimitedintheirdailyactivitiesbasedonthequestionForthepastsixmonthsatleast,to
whatextenthaveyoubeen limitedbecauseofahealthproblem inactivitiespeopleusually
do?
Missingvaluesare treatedbycasewisedeletion.Descripti