Ester Lazzari

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Hi there! I am postdoctoral research fellow at the University of Vienna. Prior to moving to Austria, I completed my PhD in demography at the Australian National University in Canberra. My research focuses on the causes and consequences of late fertility and on the ways in which medically assisted reproduction affects fertility trends. My work has examined the impact of assisted reproduction on family size, with a particular focus on its contribution to the recovery of births at older ages. Other of my research interests include fertility preferences, social age norms for childbearing, and the association between education and fertility. My research has been published in demographic and medical journals such as Population and Development Review, Human Reproduction, and Population Studies.
You can follow me on Twitter to keep up to date with my most recent research.
Here is my CV.


Parental Sociodemographics of Medically Assisted Reproduction Births in the United States: A Dyadic Population-Level Study

E Lazzari, K Tierney - Fertility and Sterility Reports

In press
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Did the COVID-19 pandemic affect childbearing desires in Australia? Understanding why people changed their attitudes towards having a first or additional child

E Lazzari, A Reimondos, E Gray - Population and Development Review

March 2023
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The Contribution of Survival to Changes in Net Reproduction Rate

T Shen, E Lazzari, V Canudas-Romo - Population Studies

March 2023
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Childbirth timing and completed family size by the mode of conception—the role of medically assisted reproduction: a population-based cohort study in Australia

SKY Choi, E Lazzari, C Venetis, GM Chambers - The Lancet Regional Health–Western Pacific

January 2023
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Projecting the contribution of assisted reproductive technology to completed cohort fertility

E Lazzari, M Potancokova, T Sobotka, E Gray, GM Chambers - Population Research and Policy Review

February 2023
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Residential proximity to a fertility clinic is independently associated with likelihood of women having ART and IUI treatment

E Lazzari, B Baffour, G M. Chambers - Human Reproduction

September 2022
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A dyadic approach to the study of perceived subfecundity and contraceptive use

E Lazzari, E Gray, B Baffour - Demographic Research

July 2022
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Cross-sectional average length of life by parity: Country comparisons

R Mogi, E Lazzari, J Nisén, V Canudas-Romo - Population Studies

April 2022
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The contribution of assisted reproductive technology to fertility rates and parity transition: An analysis of Australian data

E Lazzari, E Gray, G M. Chambers - Demographic Research

November 2021
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Changing trends between education, childlessness and completed fertility: a cohort analysis of Australian women born in 1952–1971

E Lazzari - Journal of Population Research

August 2021
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Pathways into childbearing delay of men and women in Australia

E Lazzari - Longitudinal and Life Course Studies

April 2021
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Educational composition and parity contribution to completed cohort fertility change in low-fertility settings

E Lazzari, R Mogi, V Canudas-Romo - Population Studies

March 2021
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Socio-economic changes in the age patterns of childbearing in Australia

E Lazzari - Australian Population Studies

November 2019
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Research Projects

POPULATION WELLBEING INITIATIVE: Fertility, parenting, and the future of population growth

In progress

More information is available here.


In progress

More information is available here.

PHD THESIS: Childlessness, delayed childbearing and assisted reproduction

April 2022

The focus of my PhD thesis is to understand how assisted reproduction, conceptualised as a contextual driver of fertility recuperation, affects fertility recovery in the context of delayed childbearing using Australia as a case-study. Demographic methods and tools, including survival analysis, decomposition techniques, and projections, are used to study the factors associated with delayed childbearing and childlessness, the contribution of assisted reproduction to current and future fertility levels, and the barriers to its utilisation. Results from this work show that in the current context of increasing postponement of family formation, assisted reproduction may play an increasingly significant role in future fertility rates and become a critical force behind the recuperation of births at older ages.
See thesis.


March 2022

What is the impact of government policies on fertility decisions? The Centre for Population of Australia commissioned this report to gain insights into measures that can support parenting and prevent fertility decline. The report highlights the importance of policies that provide stability and support for raising children, such as parental leave and affordable childcare, as well as measures that reduce the financial burdens on parents. It also emphasizes the significance of promoting shared gender roles through public policies that support both parents’ engagement in work and family life, including access to leave and childcare services. Additionally, the report acknowledges that assisted reproductive technology can broaden the range of possible responses to low fertility rates, although its future impact on fertility rates remains uncertain.
See full report.


Australian Population Conference
(2020 – virtual; 2022 - Canberra)
British Society for Population Studies Conference
(2022 – Winchester)
European Population Conference
(2022 – Groningen)
International Population Conference
(2021 – virtual)
Population Association of America
(2021 – virtual; 2022 – Atlanta; 2023 - New Orleans)

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