Retail spending has risen from the December quarter's super-heated levels, growing 0.9 per cent in the first three months of the year in dollar terms and 0.5 per cent in volume terms.
Compared with the March quarter last year, sales volumes were up 3.5 per cent.
When petrol stations and car yards are excluded, "core" retail sales were up 0.6 per cent for the quarter and 2.5 per cent for the year, in volume terms.
Bank of New Zealand head of research Stephen Toplis said the number "provided further evidence that the economy is ticking along nicely, thank you", particularly as the December 2012 quarter had been so strong - up 1.9 per cent in volume terms - that a correction might have been expected.
Ten of the 15 categories the statisticians divide retailers into recorded increased sales volumes, although none was large by historical standards.