Examining age, period and cohort effects in attitude change to childhood vaccinations in a representative New Zealand survey: a multiyear cohort-sequential growth modelling study.

OBJECTIVES: Vaccinations are an important preventative measure in reducing the spread of infectious diseases worldwide. However, concerns of undervaccination during childhood have become increasingly common. The current study aims to investigate changes in attitudes towards childhood vaccinations prior to the COVID-19 pandemic using a national sample from New Zealand. DESIGN: Age-based, period-based, and cohort-based changes were assessed using cohort-sequential latent growth modelling in 11 overlapping birth cohorts, which spanned the ages of 23-79 years. SETTING AND PARTICIPANTS: Data were taken from the New Zealand Attitudes and Values Study where 58 654 adults completed at least one wave across a 7-year period (2013 and 2015-2019). RESULTS: The period-based and cohort-based models fit the data equally well (χ2(282)=8547.93, p<0.001, comparative fit index, CFI=0.894, root mean square error of approximation, (RMSEA)=0.074, standardised root mean square residual, SRMR=0.105; χ2(273)=8514.87, p<0.001, CFI=0.894, RMSEA=0.075, SRMR=0.105, respectively) suggesting societal factors contribute to childhood vaccination attitudes. Additionally, the findings suggest attitudes towards childhood vaccinations were becoming increasingly more positive in all birth cohorts (ps<0.001), with younger and older birth cohorts exhibiting even positive attitudes compared with middle-aged cohorts. CONCLUSION: Overall, both the cohort-based and period-based models reveal changes in vaccination attitudes suggesting that even prior to the COVID-19 pandemic, societal influences had an impact on attitudes towards childhood vaccination.

Thinking twice: examining gender differences in repetitive negative thinking across the adult lifespan.

Background: A wealth of literature shows that women report greater levels of repetitive negative thinking, particularly rumination, than men in adolescence and adulthood. However, little research has examined how these gender differences develop or change across the entire adult lifespan. Methods: The present study addresses these oversights using a nationwide longitudinal probability sample of adults over 12 annual assessment points (N = 64,901; Mage = 42.50, range 18-81; 62.9% women) and a single-item measure of global repetitive negative thinking. Critically, we use multigroup cohort-sequential latent growth modeling to determine whether changes in this construct over time are due to (a) normative aging, (b) generational differences associated with the historical period one was born and raised in, or (c) a combination of these processes. Results: Our results reveal that rumination peaks in young adulthood for both women and men but declines steadily thereafter, reaching its lowest levels at the end of the adult lifespan. That said, some gender and cohort differences emerged, with young women-particularly young cohorts-reporting higher levels of rumination than their male counterparts and older birth cohorts. Discussion: Our study suggests that gender differences in rumination may be most prevalent among young birth cohorts, though future research is needed to elucidate the mechanisms underlying these processes.

Social dominance orientation and right-wing authoritarianism across the adult lifespan: An examination of aging and cohort effects.

Social dominance orientation (SDO) and right-wing authoritarianism (RWA) are foundational constructs in intergroup relations, yet their development across the lifespan is poorly understood. The few studies on the topic demonstrate that age positively correlates with both SDO and RWA. However, it is unclear whether this association is due to (a) normative aging, (b) generational differences associated with the period in which one was born and raised, or (c) a combination of these processes. This study estimates a series of cohort-sequential latent growth models to examine change due to both aging and cohort effects using 11 annual waves of longitudinal panel data collected from a nationwide random sample of adults (Ns = 61,858-61,862). Mean levels of SDO and RWA both trended upward across the adult lifespan, although this pattern was more marked for RWA. Cohort effects also emerged for both constructs and were again more pronounced for RWA. Contextual factors thus appear to influence authoritarianism more than they impact the preference for intergroup hierarchy. Similar trends emerged when differentiating birth cohorts by gender and ethnic majority status. Age and cohort effects for generalized prejudice among an ethnic majority group were also assessed (N = 47,955), revealing that prejudice declined in early adulthood but began to stabilize in middle age. This is the first large-scale study to document how SDO, RWA, and generalized prejudice change over the adult lifespan while also examining trends associated with the period in which a person was born and socialized. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Change in weight-based bias over a decade: A longitudinal nationally representative survey.

Background: Globally, the prevalence of obesity has almost tripled in the last 45 years, and almost 2 billion adults are considered overweight or obese. Such individuals have been shown to experience bias and stigma in their everyday life. While some prior research suggests that there has been an increase in weight-based bias over time, there have also been active efforts to counteract weight-based bias over the past decade. The current study uses cohort-sequential growth curve modelling on a nationally representative survey to examine change in weight-based bias over the last decade. The study also investigates whether changes in weight-based bias reflect developmental changes that occur with age, or whether there are cohort-based differences in such bias. The current study also examines whether there are gender differences in weight-based bias over the past decade. Methods: We used data from the New Zealand Attitudes and Values Survey (NZAVS). The NZAVS is an ongoing study that has been conducting an annual longitudinal panel survey of adult New Zealanders since 2009. There were 61,051 participants who responded to at least 1 out of the 11 waves available from the NZAVS. We used a feeling thermometer measure to assess attitudes toward people who are overweight over eleven years. Findings: We found that weight-based bias has remained relatively stable over the last decade. Small cohort-based differences occurred for women within four younger birth cohorts (those born 1990-1986; 1980-1976; 1975-1971; and 1970-1966) revealing a small increase in warmth towards people who are overweight. Both men and women showed a slight gradual increase in warmth toward people who are overweight, which peaked in middle age. Interpretation: Weight-based bias appears relatively stable over the past decade. These small changes do not appear to reflect developmental changes as a function of ageing. However, small decreases in weight-based bias among younger birth cohorts of women may reflect shifting societal norms about the acceptability of weight-based bias, although future work is needed to better understand this. Funding: Collection of the NZAVS data analysed in this paper was supported by a grant from the Templeton Religion Trust (TRT0196) awarded to the last author.

Political attitude change over time following COVID-19 lockdown: Rallying effects and differences between left and right voters.

Restrictions to curb the spread of COVID-19 have required widespread compliance over long periods, but citizens' attitudes to these often change over time. Here, we examine the time course of political attitudes in New Zealand over the months before and after the announcement of the country's first nationwide COVID-19 lockdown in 2020 using a large-scale national survey (Ns = 41,831-42,663). Government satisfaction increased immediately following the lockdown announcement and remained elevated 5 months later. Trust in institutions and political efficacy also increased gradually over the same period. However, these trends varied by political party vote: Compared to center-left voters who supported the largest governing party, center-right voters who supported the opposition party returned to baseline levels of government satisfaction quicker and showed more pronounced dips in their satisfaction with the economy. These same attitudes also predicted compliance with COVID-19 guidelines. Results illustrate a rally-around-the-flag effect during the pandemic and suggest that support wanes faster among center-right (opposition party) voters.

Ten-year panel data confirm generation gap but climate beliefs increase at similar rates across ages.

Accumulating evidence indicates that climate change awareness and concern has increased globally, but commentators suggest a climate change generation gap whereby younger people care more about climate change than older people. Here we use a decade of panel data from 56,513 New Zealanders to test whether belief that "Climate change is real" and "Climate change is caused by humans" increased over the 2009-2018 period; and whether changes are uniform across 12 five-year birth cohorts spanning those born from 1936 to 1995. Results confirm a generation gap in mean (intercept) climate change beliefs but not in over-time increase (slope). The generation gap occurs because older cohorts started from a lower initial belief level (circa 2009), but all age cohorts increased their belief level at a similar rate over the last decade; and these results were not qualified by respondents' gender. The findings offer hope for collective action that bridges efforts across generations.

Testing the Social Identity Model of Collective Action Longitudinally and Across Structurally Disadvantaged and Advantaged Groups.

Although the social identity model of collective action (SIMCA) demonstrates that identity, efficacy, and injustice are key correlates of collective action, longitudinal tests of these causal assumptions are absent from the literature. Moreover, most collective action research focuses on disadvantaged groups' responses to injustice, with few studies examining what motivates advantaged groups to protest. We address these oversights using nationally representative longitudinal panel data to investigate SIMCA among members of disadvantaged (N = 2,574) and advantaged (N = 13,367) groups. As hypothesized, identity predicted increases in injustice, efficacy, and collective action support over time. In turn, injustice (but not efficacy) mediated the longitudinal association between identity and collective action support. Notably, results were largely consistent across disadvantaged and advantaged groups. Thus, we provide the first demonstration that identity temporally precedes collective action across objectively disadvantaged and advantaged groups, but identify complexities regarding the role of efficacy in protest.

Social Media Use Is (Weakly) Related to Psychological Distress.

Although the growing prevalence of social media usage raises concerns about its potentially negative impact on mental health and distress, research has found mixed results. This study resolves these inconsistencies by examining the association between hours of time spent on social media use and psychological distress in a sample of New Zealand adults (N = 19,075). After adjusting for demographics and time spent on various other activities (e.g., exercise, sleep, and housework), social media use correlated positively with psychological distress. Although social media use had one of the largest per-hour unit associations with psychological distress compared with time spent engaging in other habitual activities, the association was very weak. Thus, only excessive amounts of social media usage would result in practical changes in distress. These findings provide robust data from a large-scale national probability sample of adults, demonstrating that social media use is typically not a serious risk factor for psychological distress.