Lung Function Of Students Research Articles

Smoking and Impaired Lung Function in Students of Technical Vocational Schools in Greece

Smoking and Impaired Lung Function in Students of Technical Vocational Schools in Greece

Effects of air pollution and green spaces on impaired lung function in children: a case-control study.

The occurrences of impaired lung function during childhood could substantially influence the health states of the respiratory system in adults. So, the effects of air pollution and green spaces on impaired lung function in children were investigated in this study. The lung function of each student was tested every year from 2015 to 2017 and the method of case-control study was applied. 2087 students aged from 9 to 11 years old of primary schools in Tianjin were ultimately included in this study. The method of propensity score matching (PSM) was performed to minimize the confounding bias and the conditional logistic regression model was carried out to evaluate the effects of indoor and outdoor environmental risk factors on the occurrences of impaired lung function in children. For every interquartile range (IQR) increase in the mixture of six air pollutants at the lag1, lag2, and lag3 periods, the risks of getting impaired lung function were increased by 53.4%, 34.7%, and 16.9%, respectively. The protective effect of greenness at lag2 period (odds ratios (OR)) = 0.022 (95% confidence interval (CI): 0.008-0.035)) was stronger than that at lag1and lag3 periods, respectively. Separate and combined effects of most air pollutants at different lag periods exerted hazardous effects on the lung function of students. Exposure to greenness had protective effects on the lung health of children.

Comparison of lower limit of normal values with a fixed ratio assessed by spirometry in obstructive and restrictive lung diseases in Indian population

Background and Aim: Spirometric parameters are approximated by the normal distribution and using lower limit of normal (LLN) minimize the misclassification with fixed-ratio protocol in interpretation of spirometry results. This study investigates prevalence and characterization of obstructive and restrictive lung function impairments, and dissimilarities between two guidelines interpreting spirometry. Methods: This study was conducted to assess the lung function in students and patients ( n = 74) of MGM Medical College, Kishanganj, Bihar, between September 2012 and May 2014, using computerized Spirometer. Results: Forced vital capacity (FVC), forced expiratory volume in the 1st s (FEV1)/FVC, forced expiratory flow25-75% (FEF25-75%), peak expiratory flow rate (PEFR) were normally distributed with inflection at their mean ± standard deviation. FEF25-75%, and PEFR were higher in normal individuals compared to individuals with respiratory disease. FEV1/FVC were lower, and FVC were higher in obstructive disease while the reverse results were obtained in restrictive disease category. Restrictive disease by fixed-ratio was found with 55% negative predictive value (NPV) and 5% positive predictive value (PPV), while the normal cases by fixed-ratio criteria was found with 91% NPV and 15% PPV versus LLN criteria. There were 58 individuals with normal spirometries under the LLN method but a discrepant of only 12 fixed-ratio normal results. Concordance analysis by kappa statistics yielded a κ = 0.017. Conclusion: Older adults are more pulmonary susceptible. The performance of LLN criteria in differentiating respiratory diseases is better than the fixed-ratio criteria. Poor agreement exist between the fixed-ratio and LLN protocols in interpreting spirometric results. There is the difference between the LLN and fixed-ratio criteria which need to be redressed with population-specific reference values.

Air pollution effects on peak expiratory flow rate in children.

Airway mucus hypersecretion Health effects caused by air pollutants may range from subtle biochemical or physiological signs, such as mildly reduced lung function, to difficult breathing, wheezing, coughing and exacerbation of existing respiratory conditions such as asthma. The aim of this study was measuring the adverse health effects of air pollution on lung function of primary school students. The lung function of students was measured daily for seven weeks in two elementary schools in District 12 of Tehran, after obtaining permission from the two principals and signed parents' consent forms. Twenty four hourly air pollution levels were used as potential predictors of lung function. The principal analysis conducted was a logistic regression on a subset of the data using a case-crossover design. The outcomes data consisted of the results of lung function tests for 356 female and 206 male students over the six-week period. Using the difference between mean (87) and maximum (125) concentration of moving average of NO in this period to judge the size of the effect, such an increase in NO is predicted to lead to an increase in the probability of poor lung function (OR=20) based on population-based predicted value. This study has shown strong and consistent associations between children's poor lung function and outdoor air pollutants in District 12 of Tehran for some pollutants. The strong association found in this study was an increase in seven-day moving average of NO using both definitions.