During the 2016 calendar year 1,478 people received a first or final warning or a third strike conviction under the Sentencing and Parole Reform Act 2010, Justice Minister Amy Adams says.

Ms Adams provided the information in response to a series of written parliamentary questions from Labour MP and justice spokesperson Jacinda Ardern on the 2010 Act.

A further question on how many people were on a "second strike" brought the response that 168 people received a final warning under the Act between June 2010 and December 2016.

Ms Adams said that at May 2017 there was the potential for two people to be convicted on a third strike in 2017.

In response to a question on whether the three strikes law had resulted in a "statistically significant reduction" in reoffending, Ms Adams said the ministry does not delineate statistically significant reduction in reoffending in relation to the 2010 Act.

Replying to a further question on recidivism rates relating to people convicted of eligible offences under the Act, Ms Adams said the ministry does not delineate recidivism rates relating to people convicted of eligible offences.

Ms Adams' response to a question from Ms Ardern on the purpose of the 2010 Act was to refer Ms Ardern to section 3 of the Act, which provides the purpose of the legislation.