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1、ARTHRITISCARE&RESEARCH45:439–445,2001ORIGINALARTICLEInactivity-AssociatedMedicalCostsAmongUSAdultsWithArthritis12121GUIJINGWANG,CHARLESG.HELMICK,CAROLMACERA,PINGZHANG,ANDMIKEPRATTObjective.ToanalyzedirectmedicalcostsamongUSadultswitharthritisandestimatethep
2、roportionassociatedwithinactivity.Methods.Inthe1987NationalMedicalExpenditureSurvey,arthritiswasdefinedusingquestionsonself-reported,doctor-diagnosedarthritisorrheumatism.Physicalactivitywasdefinedusingaself-reportquestiononlevelofactivity.Inactivity-associat
3、edmedicalcostswerederivedbysubtractingcostsforactiveadultsfromcostsforinactiveadultsaftercontrollingforfunctionallimitation.Results.Among5,486adultswitharthritis,inactivepersonshadhighermedicalcoststhandidactivepersonsinalldemographicgroupsexamined.Inmultiv
4、ariatemodelsadjustingforkeycovariates,theproportionofcostsassociatedwithinactivityaveraged12.4%($1,250in2000dollars)andrangedfrom7.8%to14.3%amongvariousdemographicgroups.Conclusion.Inactivity-associatedmedicalcostsamongpersonswitharthritisareconsiderable.Ph
5、ysicalactivityinter-ventionsmaybeacost-effectivestrategyforreducingtheburdenofarthritis.KEYWORDS.Arthritis;Costs;Economic;Physicalactivity.INTRODUCTIONTheeconomicburdenofarthritisisalsoenormous.Di-rectandindirectcostshavebeenincreasingintheUS,Arthritisandot
6、herrheumaticconditionsareamajorfrom$21billion(about1%ofthegrossnationalproduct)healthproblemintheUnitedStates,affecting15%ofthein1980to$54.6billionin1988and$65billionin1992population(43millionpersons)in1990andaprojected(6–8).About23%ofthecostswereattributab
7、letothe18.2%(60millionpersons)by2020(1).Arthritisisadirectcostsofmedicalcare;theremainderreflectedindi-leadingcauseofchronicpain;isassociatedwithavarietyrectcostsduetolostproductivity(8).ofhealthproblemssuchasobesity,physicalinactivity,Becauseofthelargeecono
8、micandhealthburdensofandgastrointestinalbleedingrelatedtouseofnonsteroidalarthritis,interestinarthritisasapublichealthproblemisantiinflammatorydrugs;isassociatedwithpoorhealth-growing.Recently,theArthri
