"While we continue to hold the position of least-corrupt country and already have high standards of conduct and integrity, we must not be complacent - these results show we're not immune to behaviour and actions that can erode the great work done by the majority of people," Curran said.
"Our focus must be on building and maintaining the public's trust in the integrity of the public sector."
Curran also said the government would strive to further improve public transparency and free access to information.
The index, released on Thursday (NZT), highlighted that most countries were making little or no progress towards ending corruption, with two-thirds of the 180 countries scoring below 50.
New Zealand's Serious Fraud Office director, Julie Read, said a lack of public corruption would also help entice investment to New Zealand.
"The result indicates that people have a high degree of confidence in our public sector, and also supports our reputation as being a safe place to invest and do business," Read said.
The world's least corrupt countries:
1. New Zealand
2. Denmark
3= Finland, Norway, Switzerland
6= Singapore, Sweden
8= Canada, Luxembourg, The Netherlands, United Kingdom
The world's most corrupt countries:
180. Somalia
179. South Sudan
178. Syria
177. Afghanistan
175= Yemen, Sudan
171= Libya, North Korea, Equatorial Guinea, Guinea-Bissau
- NZN
