Nursing Medical News about Tuberculosis Body Mass Index

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A consistent log-linear relationship between tuberculosis incidence and body mass index
International Journal of Epidemiology, 10/12/09

Lonnroth K et al. – There is a strong and consistent log–linear relationship between TB incidence and BMI across a variety of settings with different levels of TB burden. More research is required to test the relationship at very low and very high BMI levels, to establish the biological mechanism linking BMI with risk of TB and to establish the potential impact on the global TB epidemic of changing nutritional status of populations.

Methods

A systematic literature review was carried out to identify cohort studies that collected data on weight and height at baseline and that used a diagnosis of active TB as the study outcome.
Weight–for–height measures used in the original studies were transformed into body mass index (BMI). Exponential trend lines were fitted to each data set.

Results

Six studies were included.
In all of them, there was a log–linear inverse relationship between TB incidence and BMI, within the BMI range 18.5–30 kg/m^2.
The average slope gave a reduction in TB incidence of 13.8% per unit increase in BMI.
The dose–response relationship was less certain at BMI <18.5 and >30 kg/m^2.

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