Pega 2013.

Trial name or title	The Tax Credit and Health Study
Methods	Cohort study; individual fixed‐effect regression analysis methods; 2002‐2009
Participants	6900 potentially in‐work tax credit eligible participants of 7 waves of the Survey of Family, Income and Employment (2001‐2009); working‐age adults (18 to 64 years); 3880 women and 3020 men; New Zealand
Interventions	In‐work tax credit
Outcomes	Primary outcomes: self rated general health; psychological distress; tobacco use
Starting date	2010
Contact information	frank.pega@otago.ac.nz
Notes	Intervention context: permanent in‐work tax credit intervention for families introduced in 2006; means‐tested to low‐ and middle‐income groups (phase out starts once main family benefit is fully tapered off; Immervoll 2009); amongst the most generous in‐work tax credit interventions internationally (up to 7% of an average income from wages; Immervoll 2009); distributed NZD 595 million to over 249,000 individuals in 2010; had a high (approximately 95% to 98%) up‐take; follow‐up for intervention to outcome measure was 1, 2 and 3 years after a change in EITC

EITC: Earned Income Tax Credit