Effects of a nationwide strategy to reduce salt intake in Samoa.

Despite the use of a pre-established criteria to exclude suspected incomplete urines, there was still a significantly higher mean urine volume of 165 ml at 18 months compared with baseline and a borderline significant increase in mean urinary creatinine of 1 mmol ( P = 0.07), which suggests there may be more under-collection at baseline, which can affect the comparability of the measurements.

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