Neural tube defects remain one of the most preventable categories of congenital disability worldwide, yet gaps in supplementation compliance and preconception awareness continue to drive preventable cases in lower-resource settings. A 14-year population-level dataset from Guangxi, China, now offers some of the most granular longitudinal evidence yet on how structured public health infrastructure — not just supplement availability — drives measurable declines in NTD incidence.
Analyzing surveillance records from 2009 to 2023, investigators tracked five parallel indicators across Guangxi's population: premarital medical check-up (PMC) rates, folic acid supplementation uptake, compliance rates, and awareness rates, alongside confirmed NTD case counts. All four intervention-related metrics showed statistically significant upward trends (p < 0.001 each). Against this backdrop, NTD incidence moved in the opposite direction, with a Cochran-Armitage trend statistic of χ² = 365.556 (p < 0.001). Spearman correlation between PMC rate and NTD incidence reached r = −0.986, an exceptionally tight inverse association for a population-level observational study. Folic acid supplementation and awareness indicators produced similarly strong negative correlations with NTD occurrence.
What distinguishes this dataset is its duration and the policy-anchored natural experiment embedded within it: China's 2009 national folic acid programme followed by Guangxi's 2010 free premarital check-up mandate created a stepwise intervention timeline against which trends can be benchmarked. The convergence of near-perfect Spearman coefficients across multiple independent indicators strengthens the inferential signal, though the study's descriptive design cannot establish strict causality — concurrent improvements in prenatal care quality, socioeconomic development, and reporting infrastructure likely contributed. The findings align with WHO-level evidence on periconceptional folate and substantially reinforce the public health case for integrating supplementation programmes with mandatory preconception contact points. For regions still designing NTD prevention strategies, the Guangxi model suggests that access alone is insufficient; structured check-up systems that deliver education and compliance support are the operational lever most tightly linked to outcome change. Incremental in design, but confirmatory at a policy-relevant scale.
