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The impact of in-work tax credit for families on self-rated health in adults: a cohort study of 6900 New Zealanders
Health Inequalities Research Program, University of Otago, Wellington, New Zealand .
Health Inequalities Research Program, University of Otago, Wellington, New Zealand .
Department of Social and Behavioral Sciences, Harvard School of Public Health, Boston, MA, United States .
Centre of Methods and Policy Application in the Social Sciences, Department of Sociology, University of Auckland, Auckland, New Zealand.
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2013 (English)In: Journal of Epidemiology and Community Health, ISSN 0143-005X, E-ISSN 1470-2738, Vol. 67, no 8, 682-688 p.Article in journal (Refereed) Published
Abstract [en]

Background In-work tax credit (IWTC) for families, a welfare-to-work policy intervention, may impact health status by improving income and employment. Most studies estimate that IWTCs in the USA and the UK have no effect on self-rated health (SRH) and several other health outcomes, but these estimates may be biased by confounding. The current study estimates the impact of one such IWTC intervention (called In-Work Tax Credit) on SRH in adults in New Zealand, controlling more fully for confounding. Methods We used data from seven waves (2002-2009) of the Survey of Family, Income and Employment, restricted to a balanced panel of adults in families. The exposures, eligibility for IWTC and the amount of IWTC a family was eligible for, were derived for each wave by applying government eligibility and entitlement criteria. The outcome, SRH, was collected annually. We used fixed effects regression analyses to eliminate time-invariant confounding and adjusted for measured time-varying confounders. Results Becoming eligible for IWTC was associated with no detectable change in SRH over the past year (=0.001, 95% CI -0.022 to 0.023). A $1000 increase in the IWTC amount a family was eligible for increased SRH by 0.003 units (95% CI -0.005 to 0.011). Conclusions This study found that becoming eligible for IWTC or a substantial increase in the IWTC amount was not associated with any detectable difference in SRH over the short term. Future research should investigate the impact of IWTC on health over the longer term.

Place, publisher, year, edition, pages
2013. Vol. 67, no 8, 682-688 p.
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
URN: urn:nbn:se:miun:diva-20657DOI: 10.1136/jech-2012-202300ISI: 000321337200010Scopus ID: 2-s2.0-84885361134OAI: oai:DiVA.org:miun-20657DiVA: diva2:678587
Available from: 2013-12-12 Created: 2013-12-11 Last updated: 2013-12-12Bibliographically approved

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Citation style
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