The statisticians report on the 1921 census noted that it was "a reasonable assumption therefore that the abnormal number of deaf-mutes . . . was the result of the extensive epidemic of infectious diseases which occurred soon after many in those age groups were born."
I statistikernes rapport fra folketællingen i 1921 står der, at "det er derfor en velbegrundet antagelse, at det unormale antal døvstumme . . . var resultatet af en omfattende epidemi af infektionssydomme, som fandt sted umiddelbart efter at mange i disse aldersgrupper blev født."