statistics

Is the NSW Covid wave peaking? NSW Health reporting suggests it is, but their statistics don’t really report that view.

On Boxing Day here in Sydney, there is another Covid wave, and some people are curious to know if it’s peaked yet. I keep thinking I’ve written my last Covid reflection, but there is always another actuarial angle! This time it is to share an insight from one of my fellow actuaries and Covid analyst, Karen Cutter.Continue Reading

The Omicron Variant is spreading fast around the world. All the evidence is pointing to higher infectiousness, and less effectiveness of vaccines. It is still not clear whether the disease is less severe. But even a less severe variant is still bad news.

Here in Australia, already nearly 5% of cases being sequenced are Omicron (rather than Delta) and NSW is back to rapid increase in case numbers from being relatively flat for the last couple of months, with a few superspreader events in the news.Continue Reading

Vaccination take-up rates are based on population estimates. For Australia as a whole, the ABS’s estimates of population are probably quite accurate. But the more localised the analysis, the greater the approximations required. Inaccuracies in population estimates are more likely in areas with large transient populations, particularly those who do not have citizenship or permanent residency. It’s probably not a coincidence that the Melbourne City Council area has the highest transient population and the lowest first dose vaccination rate in the whole of NSW and Victoria.Continue Reading

How does Australia’s 2021 Covid19 wave compare to 2020? So far, cases are around three times higher and deaths are around a third of last year.

Today’s analysis is a quick graph. I’ve seen this graph from lots of other countries, but now here in Australia our latest wave is big enough to categorically show that vaccination has made a difference compared with the Victorian wave last year. As you can see, in 2020, deaths lagged cases by around 2-3 weeks. This year, the death rates compared with numbers of cases is substantially lower, and the rate also looks as if it is slightly improving.Continue Reading

Are the Doherty Institute assumptions about vaccine effectiveness optimistic? And does it matter? Yes and yes. So we should monitor the spread of Covid19 closely as vaccination rates increase, and use 70% and 80% adult vaccination rates as guides, rather than stick to then as rigid rules to decide how to ease restrictions across Australia.

A reminder that the Doherty Institute report makes it clear that to control the Delta variant, ongoing public health and social measures such as contact tracing, isolating, and restraints on social mixing (compared with pre virus days) are needed no matter what vaccination rate is achieved, so a gradual guided relaxation of measures is what is recommended anyway.Continue Reading

What factors seem to lead to higher or lower vaccination rates in NSW? I’ve adjusted the NSW location vaccination rates for the age mix of each location. The strongest correlation is with income levels – the higher the income, the more likely the population is to have had at least one dose of vaccine. Surprisingly, the percentage of the population who speaks a language other than English doesn’t seem to make much difference. Continue Reading

Sobering statistics on sexual harassment in Australia. Of the 20 million people in Australia over the age of 15, in the last 12 months approximately 1.6 million women and 840,000 men – nearly 2.5 million people – have experienced sexual harassment of any kind. Included in this are 148,000 women and 57,000 men who were sexually assaulted  – 201,000 people.Continue Reading