Association of urinary sodium/creatinine ratio and urinary sodium/specific gravity unit ratio with blood pressure and hypertension: KNHANES 2009-2010.

•Blood pressure (BP) increased with increasing urinary sodium/creatinine ratio.•Risk for hypertension was increased in high urinary sodium/creatinine ratio.•Urinary sodium/specific gravity unit ratio also associated with BP/hypertension.•A spot urine specimen can be used for sodium intake monitoring.