Beginning in 2017, Heffer and coauthors surveyed 6th, 7th, and 8th graders in Ontario, Canada once a year for two years. The researchers also conducted annual surveys of undergraduate participants, beginning in their first year of university over a span of 6 years.
Kuqala ngowezi-2017, uHeffer nabhala nabo basaveya abafundi bebanga lesi-6, lesi-7 nelesi-8 e-Ontario, eCanada kanye ngonyaka iminyaka emibili. Abacwaningi babuye benza amanye amasaveyi abafundi abangakazitholi iziqu, kusukela onyakeni wokuqala enyuvesi esikhathini esiyiminyaka eyisithupha.