Jennifer Lang

Jennifer Lang

@actuarialeye.bsky.social

Sydney based actuary and director looking at the world through an actuarial eye. Lots of statistics, often feminist. She/her

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I’ve published my annual reading list for 2025 here, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular highlights from this year’s books, which, as always, are a bit of an eclectic mixture.https://actuarialeye.com/2026/01/26/what-did-i-read-in-2025/

actuarialeye.comWhat did I read in 2025?I’ve just published my annual reading list for 2025 here, (a little late, but its still January!) as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular h…
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Worldwide mortality experience since the beginning of the COVID-19 pandemic (2020-2024) shows excess deaths over that period in almost every country measured. Australia (+6%) was below average, and New Zealand (+0.1%) the lowest we measured.

In our view, the “new normal” level of mortalitywill continue to improve, but we expect it to stay above the pre-pandemic trend for some time. Our baseline prediction for 2025 implies that the COVID-19 pandemic has resulted in a three-year pause in mortality improvement. #ends

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Mortality rates from other causes were quite mixed compared with previous years, with other respiratory diseases (eg pneumonia +10%) and lower respiratory conditions (+5%) higher than anticipated, and deaths from cancer (-2%) and ischaemic heart disease (-3%) lower than the baseline.

There's a whole lot of caveats around this - we could mitigate the worst experience - but there will also be other causes of death not counted here, like bushfire pollution, natural disasters, and increased tropical disasters.

The research I found, from Our World in Data, shows that in the hotter months, Australia is already getting around 0.6% extra deaths every summer due to climate change related heatwaves, or 300-350 extra deaths.

Further research (repackaged by Our World In data) concluded that heat related deaths would increase by 7.68 per 100,000 people by 2030, 20.39 by 2050, and 49.93 by 2090. that’s an increased death rate of 1%, 3% and 7% in 2030, 2050 and 2090 respectively.

The extra deaths will mostly be at older age groups, and among those who find it harder to shelter from heat. There are likely to be other climate related reasons death rates will increase – extra pollution from fires, more tropical diseases, natural disasters not included in this number.

Most deaths in heatwaves don't mention heat on the certificate. You probably pictured someone passing out from heat stroke. But this is not how most people die from “heat”. They die from conditions such as cardiovascular or kidney disease, respiratory infections, or diabetes.

The Mortality Working Group of the Actuaries Institute (Australia) has just released our analysis of mortality for the first 11 months of 2024. Total mortality was 1% higher than predicted, almost all because Covid-19 was higher than we predicted. #thread

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The Mortality Working Group of the Actuaries Institute (Australia) has just released our analysis of mortality for the first 11 months of 2024. Total mortality was 1% higher than predicted, almost all because Covid-19 was higher than we predicted. #thread

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For other causes of death, respiratory deaths (excluding Covid-19) were 7% higher than predicted, with five times as many deaths from Covid-19 as from influenza. Deaths from cancer wwere 2% lower than predicted.

The table below shows all major causes of deaths for the eleven months to November 2024, with the overall picture showing 1,400 more deaths than our prediction, all of which is explained by the extra deaths from Covid-19.

The Mortality Working Group of the Actuaries Institute (Australia) has just released our analysis of mortality for the first 11 months of 2024. Total mortality was 1% higher than predicted, almost all because Covid-19 was higher than we predicted. #thread

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The Mortality Working Group of the Actuaries Institute (Australia) has just released our analysis of mortality for the first 11 months of 2024. Total mortality was 1% higher than predicted, almost all because Covid-19 was higher than we predicted. #thread

We projected mortality for 2024 to include two waves of Covid-19, both lower than 2023, and all other mortality to be an improvement on 2023 (using the same trends as the last few years). Instead, Covid-19 has led to about the same level of deaths as it did in 2023 so far. 2/x

This graph shows the Covid deaths from and with Covid-19 for 2022, 2023 and 2024, and our predicted level of deaths from Covid-19 during 2024. We had projected two waves of Covid-19 during 2024, both lower than 2023, but instead they were fairly similar.

I’ve just published my annual reading list for 2024, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular favourites from this year’s list, which, as always, is a bit of an eclectic mixture. actuarialeye.com/2025/01/13/w...

actuarialeye.comWhat did I read in 2024?I’ve just published my annual reading list for 2024, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular favourites from this year’s list, which, as al…
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And my fiction highlight this year was The City and the City, by China Miéville. I found this book via all the city builders I’ve been following on social media, yet it is fiction. It is a police procedural set in two cities in the same geographical space, separated, but yet intertwined.

I’ve just published my annual reading list for 2024, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular favourites from this year’s list, which, as always, is a bit of an eclectic mixture. actuarialeye.com/2025/01/13/w...

actuarialeye.comWhat did I read in 2024?I’ve just published my annual reading list for 2024, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular favourites from this year’s list, which, as al…
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I read a lot about cities this year - this was the best. Age of the City, by Ian Goldin and Tom Lee-Devlin This book is a broad history of the city, and why urbanisation continues to be an unstoppable force around the planet. It finishes by suggesting ways of improving any city.

I love a good general history - this was my favourite this year. How the World made the West, by Josephine Quinn Quinn wrote this book to refute the idea that the only early societies worth studying to explain our own are the ancient Greeks and Romans. It's also a fascinating history on its own.

I’ve just published my annual reading list for 2024, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular favourites from this year’s list, which, as always, is a bit of an eclectic mixture. actuarialeye.com/2025/01/13/w...

actuarialeye.comWhat did I read in 2024?I’ve just published my annual reading list for 2024, as I’ve done for over a decade. Do check out the whole thing, but here are a few of my particular favourites from this year’s list, which, as al…

My favourite: How Big Things Get Done, by Bent Flyvbjerg and Dan Gardner Flyvbjerg and his coauthor Gardner use their experience and analysis of all decades of projects to take out a pithy set of lessons about how best to make big projects work as intended.

The table shows that mortality from Covid-19 and respiratory diseases have all been above our predicted levels for the year to August, while deaths from most other diseases have been slightly below our prediction. 5/x

Covid-19 continues to be a significant new source of mortality in the Australian population, with no signs that Covid-19 deaths are replacing deaths from other causes. Deaths from Covid-19 in the year to August 2024 were five times the number of deaths from flu. /ends

Total deaths from all causes have, in aggregate, been higher than our prediction in the 8 months to August 2024. Actual weekly deaths have nearly always been within the 95% confidence interval. However, most weeks in June, July and August were above the prediction. 4/x

We projected mortality for 2024 to include two waves of Covid-19, both lower than 2023, and all other mortality to be an improvement on 2023 (using the same trends as the last few years). Instead, Covid-19 has led to about the same level of deaths as 2023 in aggregate so far. 2/x

Jennifer Lang reposted

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More than 2,800 Australians have died from COVID-19 in the first seven months of 2024, 1,200 (71%) higher than anticipated, and more than predicted for the whole year. The wave of COVID-19 deaths that began in Australia in May started to abate in July.

For the seven months to July, total mortality was 2,400 (2%) higher than the prediction (which includes anticipated COVID-19 deaths). Half of this excess has been caused by higher than predicted COVID-19 mortality, and almost a further quarter by other respiratory diseases.