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From: Joint effects of temperature and humidity with PM2.5 on COPD
Associations of the daily mean and difference in ambient temperature, relative humidity (RH), and particulate matter with an aerodynamic diameter of鈥�&濒迟;鈥�2.5聽渭m (PM2.5) for 1-day, 7-day, and 1-month mean and difference with the odds ratio (OR) for chronic obstructive pulmonary disease (COPD), forced expiratory volume in 1聽s (FEV1), forced vital capacity (FVC) and FEV1/FVC. Data are presented as the OR for COPD and FEV1/FVC estimates with a 95% confidence interval (CI). Covariates adjusted for in the models were age, sex, smoking, and body mass index (BMI). Red asterisk (*) indicates statistical significance at p鈥�&濒迟;鈥�0.05