In international rankings, there's a club of usual suspects that more often than not does really well.
Finland and other Nordic nations often come out on top, be it in quality of life, education or healthcare. On the other side of the world, New Zealand and Australia appear to have become members of that exclusive club, too, while the United States consistently misses out.
When the United Nations released its annual World Happiness Report last year, these usual suspects made it to the top 10 once again. But more surprisingly, they also led in another, less favourable recent statistic: The ratio of citizens affected by mental health disorders. A separate 2017 study by the World Health Organisation concluded that citizens of Australia, besides Americans, Ukrainians and Estonians, were more likely to develop depression than people living anywhere else in the world. Other strongly affected nations included New Zealand and Nordic states such as Finland and Denmark.
Studies with a slightly different research focus or methodology have observed similarly severe or even worse mental health issues among children growing up in poorer countries such as India, and it is likely that mental health issues are substantially underreported in many developing nations.
But the mental health crisis that increasingly appears to affect young people from wealthier countries has baffled scientists more than other findings that could be explained by inequality or poverty. Australia became the latest country to announce new efforts to combat the growing problem this week, promising on Wednesday to fund mental health programmes for young people with an additional A$34 million ($36m).