Inducing age-related disgust increases negative attitudes towards the elderly

An a priori power analysis using G*Power (version 3.1; Faul et al., 2009) for an ANCOVA with three independent groups and four covariates, with a = 0.05, power = 0.8, and an effect size of = 0.25, recommended a minimum sample size of n = 269. An extra 20% was added to the minimum sample size to account for potential incomplete and/or bad data (Galesic, 2006), bringing the required sample size to n = 324. Ultimately, n = 324 participants completed the study with 49.7% identifying as female and 50% as male and 0.3% identifying as other. The mean (M) age of the participants was 34.79 (standard deviation, [SD] = 7.40) years. In terms of ethnicity, 91.7% of the participants identified as White, 2.2% as Asian or Asian British, 1.5% as Black, Black British, Caribbean, or African, 0.9% as Arab and 3.7% as Mixed or multiple ethnic groups. Participants were compensated £1.50 for the 10-min duration of the study, in line with guidance from Prolific Academic. The study was approved by the institutional Research Ethics Committee (053946).