In 1961, 95 per cent of children were born to married couples; by 2015 the proportion had fallen to 53 per cent. For Maori, 72 per cent of births were to married parents in 1968; by 2015 the proportion had fallen to just 21 per cent.
Single-parent families make up 28 per cent of all families with dependent children. Yet 51 per cent of children in poverty live in single-parent families. And single parents have the lowest home-ownership rates and the highest debt ratios.
But this isn't just about single parents and the unique challenges and stresses that it brings.
In 2015, 27 per cent of registered births were to cohabiting parents. But by the time the child is aged 5, the risk of parental separation is four to six times greater than for married parents.
Despite marriage being one of the best protectors against child poverty, it has become politically unfashionable - some argue insensitive - to express such a view, but reducing child poverty rates will require encompassing analysis and debate.
Based on the evidence, New Zealand's rapidly changing family structure - including the declining marriage rate and the high solo parent rate (especially amongst Maori, who also have a disproportionately high teen pregnancy rate) - has contributed significantly to increasing income inequality.
It's time to talk about family structure, about marriage, about family breakdown – and the links they have to some of our negative social statistics that we must address.
But whenever marriage is promoted, it has often been labelled as an attack on solo or divorced parents, and that has kept us from recognising the qualitative benefits of marriage which have been discovered from decades of research.
In virtually every category that social science has measured, children and adults do better when parents get married and stay married – provided there is no presence of high conflict or violence.
This is not a criticism of solo parents or divorcees. They deserve all the support we can provide them. It simply acknowledges the benefits of the institution of marriage.
As the author of our report warned, suspension of fact is an abrogation of our collective responsibility to children.
Until we face some of these inconvenient facts, we won't solve the problem.
Bob McCoskrie is the national director of Family First NZ. Views expressed here are the writer's opinion and not the newspaper's. Email: editor@hbtoday.co.nz