translate English to French: Moreover, the prevalence of several chronic conditions, as well as activity limitation due to illness, has declined over the past 20 years.
Enquête santé Canada de 1978-1979; Enquête nationale sur la santé de la population de 1998-1999, échantillon transversal, Fichier santé * Valeur significativement différente de la moyenne nationale, p < 0,05