Summary
This early epidemiological study investigated the potential environmental health pathway from agricultural nitrate fertiliser use to stomach cancer mortality, analysing 25 provinces. A significant positive correlation (r = +0.672, p < 0.004) was found between nitrate fertiliser application intensity and age-standardised stomach cancer death rates; when three industrialised provinces were excluded from analysis, the association strengthened substantially (F = 16.47, p < 0.0006). The work represents an early signal of concern linking synthetic nitrogen inputs to human health outcomes, though predates detailed mechanistic understanding of nitrate metabolism and N-nitroso compound formation.
Regional applicability
The study's geographic context is not specified in the available metadata, limiting direct applicability assessment to United Kingdom conditions. If conducted in a European or North American context, historical relevance to UK agricultural practice would depend on fertiliser application patterns and stomach cancer epidemiology of the 1970s, though modern nitrate regulations have substantially tightened since publication.
Key measures
Nitrate fertiliser use per unit area (kg/ha); age-standardised stomach cancer mortality rates by province; Pearson correlation coefficient; regression analysis
Outcomes reported
The study examined the association between nitrate fertiliser application intensity (kg/ha) and age-standardised stomach cancer mortality rates across provinces. A significant positive correlation was identified between nitrate use per unit area and stomach cancer death rates.
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