Women's lung function decline after eight years of an efficient stove intervention

摘要

Background. A randomized controlled trial was conducted in the Central Mexican state of Michoacan to evaluate the health impact of the introduction of an efficient biomass stove Patsari in young Mexican women during 2005 and 2006. Actual use of the Patsari stove was associated with a lower FEV1 decline (31 mL) compared to the open fire use (62 mL) over 1 year of follow up. Aims. The aim of this study is to perform a longitudinal assessment of the lung function decline in women after eight years of the introduction of efficient biomass stoves in highland Michoacan, Mexico. Methods. We are performing a longitudinal study on the women cohort established during the previous study in the Purepecha region in the state of Michoacan, Mexico. Biomass smoke exposure is estimated by a questionnaire recalling open fire and stove use since 2005. Following the same standardized procedure as in the previous study, spirometry is conducted using portable battery-operated ultrasonic spirometer in accordance with the ATS/ERS recommendations. The longitudinal FEV1 regression slope is calculated with SPIROLA V3.0 software. The association between lung function decline by reported stove use is analyzed using linear regression models. Results. In a subsample of 37 women from Quinceo, the mean group slope is -19mL/year with an absolute within-person variation of 110 mL Women mainly using an open fire have an excess lung function decline of -14 mL/year compared to those women mainly using the efficient stove (p=0.104) adjusting for height, FEV1 and age at baseline. Conclusions. This is the first study reporting the longitudinal assessment of the lung function decline (more than seven years of follow up) for women using fuelwood for cooking. These results for a subsample suggest the mid-term positive effect of the intervention.