Reducing salt intake for prevention of cardiovascular diseases in high-risk patients by advanced health education intervention (RESIP-CVD study), Northern Thailand: study protocol for a cluster randomized trial

Table 3 Study outcome, outcome measurement and assessment methods

Outcome	Assessment	Outcome measure
Primary	Blood pressure	Omron HEM-907 IntelliSense professional digital blood pressure monitor
Secondary	Individual salt intake estimate/24-hour	Overnight urine collection and measurement of urine sodium using the KME-03 (average of 3 successive days’ measurements)
Clinical	CVD risk	General Framingham score 10-year risk
	CVD incidence	Diagnosis of each CVD event and CVD death
	Surrogate outcome	Retinal vessel caliber

ISSN: 1745-6215