Since closures tend to occur alongside other interventions such as bans on public gatherings, it can be difficult to measure the specific impact of school closures. During the 1918-1919 influenza pandemic in the United States, closing schools and banning public gatherings was associated with a lower total death rate.
Kwa vile kufungwa huwa hufanyika kwa wakati moja na mikakati mengine kama vile kupigwa marufuku kwa mikusanyiko ya umma, inaweza kuwa vigumu kupima athari maalum ya kufungwa kwa shule.Katika kipindi cha janga la homa ya mafua ya 1918-1919 huko Marekani, kufungwa kwa shule na kupigwa marufuku mikusanyiko wa watu hadharani yalihusishwa na nambari chache ya vifo.