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Most spot urine tests accurately estimate population salt intake in India. Some equations, like Kawasaki, may overestimate intake, potentially due to collection methods.

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Area of Science:

  • Nutritional Epidemiology
  • Public Health Nutrition
  • Urology

Background:

  • Accurate assessment of population salt intake is crucial for public health interventions.
  • Dietary salt intake is a significant modifiable risk factor for hypertension and cardiovascular diseases.
  • Traditional 24-hour urine collections are accurate but burdensome; spot urine samples offer a more practical alternative.

Purpose of the Study:

  • To compare population salt intake estimates derived from spot urine samples against 24-hour urine collections in North and South India.
  • To evaluate the accuracy of various established spot urine estimating equations for salt intake.

Main Methods:

  • A cross-sectional survey was conducted in urban and rural communities across North and South India.
  • Participants provided both 24-hour urine collections and random morning spot urine samples.
  • Salt intake was estimated from spot urine using multiple established equations and compared with 24-hour collection data.

Main Results:

  • A total of 957 individuals completed both sample collections.
  • Most spot urine equations (e.g., Tanaka, Mage, INTERSALT) provided estimates within 1 g/day of the 24-hour collection reference.
  • The Toft and Kawasaki equations showed higher estimates, with Kawasaki overestimating by 3-4 g/day.

Conclusions:

  • Spot urine-based equations are generally reliable for estimating mean population salt intake in diverse Indian settings.
  • Discrepancies observed with certain equations may stem from misalignments in specimen collection protocols.
  • The findings support the utility of spot urine samples for large-scale salt intake monitoring in India.