Estimated dietary sodium intake in Thailand: A nationwide population survey with 24-hour urine collections

Thailand has committed to reducing population sodium intake by 30% by 2025. However, reliable nationally representative data are unavailable for monitoring progress toward the goal. We estimated dietary sodium consumption using 24-hour urinary analyses in a nationally representative, cross-sectional population-based survey. We selected 2388 adults (aged ≥ 18 years) from the North, South, North-east, Central Regions, and Bangkok, using multi-stage cluster sampling. Mean sodium excretion was inflated by 10% to adjust for non-urinary sources. Multivariate logistic regression was performed to assess factors associated with sodium consumption ≥ 2000 mg. Among 1599 (67%) who completed urine collection, mean age was 43 years, 53% were female, and 30% had hypertension. Mean dietary sodium intake (mg/day) was 3636 (±1722), highest in South (4108 ± 1677), and lowest in North-east (3316 ± 1608). Higher sodium consumption was independently associated with younger age (Adjusted Odds Ratio (AOR) 2.81; 95% Confidence interval (CI): 1.53-5.17; p =.001); higher education (AOR 1.79; 95% CI: 1.19-2.67; p =.005), BMI ≥ 25 (AOR 1.55; 95% CI: 1.09-2.21; p=.016), and hypertension (AOR 1.58; 95% CI: 1.02-2.44; p =.038). Urine potassium excretion was 1221 mg/day with little variation across Regions. Estimated dietary sodium consumption in Thai adults is nearly twice as high as recommended levels. These data provide a benchmark for future monitoring.