In cross-sectional studies, problems with cohort effects will be especially strong when

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Cohort effects refer to differences between groups of people who were born in different time periods and grew up in different social and historical contexts. When the cohorts in a cross-sectional study differ widely in age, it is more likely that they will have experienced different historical events, cultural attitudes, and social norms that could influence their behavior and attitudes. This makes it harder to tease apart the effects of age, cohort, and period, and to draw firm conclusions about the causes of observed differences between the cohorts.

In Cross-Sectional Studies, Problems with Cohort Effects Will Be Especially