Intervention
The study salt (usual salt or salt substitute) supply to the kitchens in facilities allocated to the progressive reduction (PR) intervention group was reduced step by step, with the goal of achieving a facility-wide reduction of salt supply by 40% by the end of the intervention [The study salt supply to the kitchens in facilities allocated to the usual supply group was not restricted. The study salt, either salt substitute or usual salt, was provided centrally every 3 months and for free.