Melbourne Institute of Applied Economic and Social Research - Research Publications

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Comparing estimates of psychological distress using 7-day and 30-day recall periods: Does it make a difference?

Chilver, MR ; Burns, RA ; Botha, F ; Butterworth, P ; Ng, QX (PUBLIC LIBRARY SCIENCE, 2023-12-08)

Self-report measures are widely used in mental health research and may use different recall periods depending on the purpose of the assessment. A range of studies aiming to monitor changes in mental health over the course of the COVID-19 pandemic opted to shorten recall periods to increase sensitivity to change over time compared to standard, longer recall periods. However, many of these studies lack pre-pandemic data using the same recall period and may rely on pre-existing data using standard recall periods as a reference point for assessing the impact of the pandemic on mental health. The aim of this study was to assess whether comparing scores on the same questionnaire with a different recall period is valid. A nationally representative sample of 327 participants in Australia completed a 7-day and 30-day version of the six-item Kessler Psychological Distress Scale (K6) and a single-item measure of psychological distress (TTPN item) developed for the Taking the Pulse of the Nation survey. Linear mixed models and mixed logistic regression models were used to assess whether altering the recall period systematically changed response patterns within subjects. No substantive recall period effects were found for the K6 or the TTPN, although there was a trend towards higher K6 scores when asked about the past 30 days compared to the past 7 days (b = 1.00, 95% CI: -0.18, 2.17). This may have been driven by the "feeling nervous" item which was rated higher using the 30-day compared to the 7-day recall period. Neither the K6 nor the TTPN item were significantly affected by the recall period when reduced to a binary variable of likely severe mental illness. The results indicate that altering the recall period of psychological distress measures does not substantively alter the score distribution in the general population of Australian adults.
The impact of employment on mental healthcare use among people with disability: distinguishing between part- and full-time employment

Saxby, K ; Dickinson, H ; Petrie, D ; Kavanagh, A ; Aitken, Z (SCANDINAVIAN JOURNAL WORK ENVIRONMENT & HEALTH, 2023)

OBJECTIVE: Employment can improve mental health among people with disability (PWD), however, little is known about how different levels of workforce participation influence mental healthcare use. The aim of this study was to estimate the extent to which different levels of working hours are associated with changes in mental healthcare use among PWD. METHODS: Data on working hours and healthcare use among working age PWD who were receiving government benefits (N=260 825) was obtained from Australian Census-linked administrative records between 2011 and 2019. Individual fixed effects panel models were used to estimate the impact of increased working hours on mental healthcare (services and prescriptions). Heterogeneity analyses by job security and key sociodemographic characteristics were conducted. RESULTS: Compared to not working, we found that working 1-14, 15-29, and ≥30 hours per week was respectively associated with a 3.3%, 18.0%, and 9.9% reduction in the use of mental healthcare prescriptions as well as a 6.8%, 18.4%, and 22.3% reduction in the use of mental healthcare services by PWD. The effects were larger for PWD in more secure work and those living in rural and disadvantaged areas. CONCLUSIONS: Working more hours was associated with reduced mental healthcare use among PWD. Policy interventions should consider the broader benefits of enabling part-time and secure work placements for PWD, particularly for those living in rural and disadvantaged regions.
Baby Bump or Baby Slump? COVID-19, Lockdowns, and their Effects on Births in Australia

Mooi-Reci, I ; Wooden, M ; Zilio, F (ELSEVIER SCI LTD, 2024-03)

This study examines changes in birth rates in Australia during the COVID-19 pandemic and the extent to which such changes were influenced by lockdowns. We use natality data at State and small regional area levels spanning the period from 2011 to 2022. In our empirical approach, we first take advantage of a unique quasi-experimental setting that arose in Victoria, Australia's second most populous State, during the first year of the pandemic. Victoria imposed a 111-day stay-at-home lockdown while other States and Territories enforced milder restrictions on social and economic activities. We then exploit lockdowns that lasted more than three months in Victoria and New South Wales in the second year of the pandemic. Within these quasi-experimental settings, our empirical approach was to first use monthly data at the State-level and estimate birth rate deviations from secular trends for the months affected by COVID-19 policies. We also estimate separate models to examine variations in births across regional areas with different compositions of Indigenous population, unemployment, low-income, and non-English speaking residents. Our findings reveal a nationwide fertility increase in 2021, but Victoria exhibited slower growth, especially in areas with higher unemployment, lower income, and more non-English speaking residents. In 2022, we find evidence of a gradual return of birth rates to pre-pandemic trends, though this is mainly concentrated in the major cities. While the second-year lockdowns had limited impacts, language-diverse areas still mostly experienced lower rates of growth in birth rates.
Are shorter cumulative temporary contracts worse stepping stones? Evidence from a quasi-natural experiment

Kabátek, J ; Liang, Y ; Zheng, K (Elsevier BV, 2023-10)

Temporary employment contracts are often regarded as ‘stepping stones’ for workers’ careers, because they can help inexperienced workers secure a permanent contract. Our study evaluates whether this stepping-stone function is moderated by the contract duration, exploiting a Dutch policy reform that shortened the maximum duration of sequences of temporary contracts with the same employers from 3 years to 2 years. Leveraging a sharp regression discontinuity design and administrative register data, we show that the reform accelerated the transitions of temporary workers to permanent contracts with the same employers, with the effect being strongest among those working for the same employers for 1–2 years. We conclude that the reform brought more job security to temporary workers without impeding the stepping-stone function of their contracts.
Financial incentives and private health insurance demand on the extensive and intensive margins.

Kettlewell, N ; Zhang, Y (Elsevier BV, 2024-03)

In countries with dual public and private healthcare systems, individuals are often incentivized to purchase private health insurance through subsidies and penalty. We use administrative data from Australia to study how high-income earners respond on both the intensive and extensive margins to the simultaneous withdrawal of a premium subsidy, and the increase of a tax penalty. We estimate regression discontinuity models by exploiting discontinuous changes in the penalty and subsidy rates. Our setting is particularly interesting because means testing creates different incentives at the extensive and intensive margins. Specifically, we could expect to see higher take-up of insurance coupled with downgrading to less expensive plans. We find evidence that the penalty - despite being large in value - only has a modest effect on take-up. Our results show little evidence of downgrading, which is consistent with a low price elasticity for the high-income earners we study.
Economic conditions and health: Local effects, national effect and local area heterogeneity

Janke, K ; Lee, K ; Propper, C ; Shields, K ; Shields, MA (Elsevier BV, 2023-10-01)
Surveillance and Self-Control

Cobb-Clark, DA ; Dahmann, SC ; Kamhöfer, DA ; Schildberg-Hörisch, H (Oxford University Press (OUP), 2023)

This paper studies important determinants of adult self-control using population-representative data and exploiting Germany’s division as quasi-experimental variation. We find that former East Germans have substantially more self-control than West Germans and provide evidence for government surveillance as a possible underlying mechanism. We thereby demonstrate that institutional factors can shape people’s self-control. Moreover, we find that self-control increases linearly with age. In contrast to previous findings for children, there is no gender gap in adult self-control and family background does not predict self-control.
Generational differences in mental health trends in the twenty-first century

Botha, F ; Morris, RW ; Butterworth, P ; Glozier, N (National Academy of Sciences, 2023-12-05)

Given the observed deterioration in mental health among Australians over the past decade, this study investigates to what extent this differs in people born in different decades-i.e., possible birth cohort differences in the mental health of Australians. Using 20 y of data from a large, nationally representative panel survey (N = 27,572), we find strong evidence that cohort effects are driving the increase in population-level mental ill-health. Deteriorating mental health is particularly pronounced among people born in the 1990s and seen to a lesser extent among the 1980s cohort. There is little evidence that mental health is worsening with age for people born prior to the 1980s. The findings from this study highlight that it is the poorer mental health of Millennials that is driving the apparent deterioration in population-level mental health. Understanding the context and changes in society that have differentially affected younger people may inform efforts to ameliorate this trend and prevent it continuing for emerging cohorts.
A randomised controlled trial of email versus mailed invitation letter in a national longitudinal survey of physicians

Harrap, B ; Taylor, T ; Russell, G ; Scott, A ; Alahdab, F (PUBLIC LIBRARY SCIENCE, 2023-08-22)

Despite their low cost, the use of email invitations to distribute surveys to medical practitioners have been associated with lower response rates. This research compares the difference in response rates from using email approach plus online completion rather than a mailed invitation letter plus a choice of online or paper completion. A parallel randomised controlled trial was conducted during the 11th annual wave of the nationally representative Medicine in Australia: Balancing Employment and Life (MABEL) longitudinal survey of doctors. The control group was invited using a mailed paper letter (including a paper survey plus instructions to complete online) and three mailed paper reminders. The intervention group was approached in the same way apart from the second reminder when they were approached by email only. The primary outcome is the response rate and the statistical analysis was blinded. 18,247 doctors were randomly allocated to the control (9,125) or intervention group (9,127), with 9,108 and 9,107 included in the analysis. Using intention to treat analysis, the response rate in the intervention group was 35.92% compared to 37.59% in the control group, a difference of -1.66 percentage points (95% CI: -3.06 to -0.26). The difference was larger for General Practitioners (-2.76 percentage points, 95% CI: -4.65 to -0.87) compared to other specialists (-0.47 percentage points, 95% CI: -2.53 to 1.60). For those who supplied an email address, the average treatment effect on the treated was higher at -2.63 percentage points (95% CI: -4.50 to -0.75) for all physicians, -3.17 percentage points (95% CI: -5.83 to -0.53) for General Practitioners, and -2.1 percentage points (95% CI: -4.75 to 0.56) for other specialists. For qualified physicians, using email to invite participants to complete a survey leads to lower response rates compared to a mailed letter. Lower response rates need to be traded off with the lower costs of using email rather than mailed letters.
For worse? Financial hardships and intra-household resource allocation among Australian couples

Botha, F ; Ribar, DC (Elsevier, 2023-02-01)

This article investigates differences in husbands' and wives' experiences of financial hardships. It develops and estimates a structural collective household model of expenditures on individual-specific necessities and hardship reporting where each partner has distinct preferences and the household makes Pareto efficient decisions. Using data from the Household, Income, and Labour Dynamics in Australia Survey with unique questions on individual financial hardships, we examine whether differences in preferences, bargaining power, or other characteristics within households affect the distribution of hardships. Wives in our data report more financial hardships than husbands. Estimates from our structural model indicate that wives have weaker preferences than husbands for expenditures on necessary goods for themselves, but there is no evidence of differences in bargaining power. Estimates further indicate that hardships increase with the number of children and spouses' disability status and decrease with spouses’ ages and subjective financial capabilities.