Infectious Disease · Public Health ·
PM2.5 Components Linked to TB Hospitalization in Hainan Study
A case-crossover study of 4,524 pulmonary tuberculosis hospital admissions in Hainan, China, found short-term increases in PM2.5 and its measured components were associated with higher hospitalization risk. Associations were significant among people in low-greenness areas, but the observational findings do not establish causality.
- Higher exposure to each measured PM2.5 component was associated with hospitalization.
- Sulphate and black carbon contributed most to component-related effects.
- Associations were significant in low-greenness areas, not other NDVI groups.
Researchers analyzed 4,524 pulmonary tuberculosis (PTB) hospital admissions in Hainan, China, from 2016 to 2019. Using a case-crossover design and conditional logistic regression with stabilized inverse probability weights, they assessed associations between hospitalization and short-term exposure to PM2.5 and five components: sulphate, nitrate, ammonium, organic matter and black carbon. They also examined whether associations varied by surrounding greenness, measured using the normalized difference vegetation index (NDVI).
For each interquartile-range increase in exposure, PTB hospitalization risk was higher by 9.77% for PM2.5, 14.68% for sulphate, 8.53% for nitrate, 10.81% for ammonium, 6.82% for organic matter and 10.07% for black carbon. Sulphate and black carbon accounted for 41.6% and 39.0%, respectively, of the total effects attributed to the five components. Associations were stronger among people aged 65 years or older, residents of prefecture-level cities and during the warm season.
Statistically significant adverse associations were observed among people in low-NDVI areas (NDVI below 0.45), but not in other greenness groups. The findings support an association, not a causal effect; the study was conducted in one region and assessed hospital admissions rather than all TB outcomes. Its authors suggest emissions reduction and increasing green space as potential public-health measures.
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BMC Public Health: Association of individual exposure to PM2.5 components with pulmonary tuberculosis hospitalization and the effect modification by greenness ↗This is an automated AI-condensed summary that has not yet been reviewed by an editor. Always consult the full item at the original source.