Smoking and Cotton Dust efficiency...

Smoking and Cotton Dust efficiencys in Cotton Textile Workers (*1)

Epidemiologic studies of cotton textile workers have demonstrated evidence of chronic lung disease resulting from occupational position to cotton dust. [1] Initially, workers have chest tightness and shortness of breath onward the first day of the work week. These symptoms subbisde as the week continues. [23] As the disease progresse symptoms worsen and may persist by the agency of the work week as well as in the absence of work exposing Older workers commonly display objective findings of pulmonary impairment. [4-6] We have characterized the patterns of lung function abnormalities in older cotton textile workers and have documented that these may be the pair obstructive and restrictive. [7] In an analysis of the lung function of these older workers, we have also shown separate smoking and cotton dust general intents [8] In addition to the independence of these ffect individual lung function parameters are not equally affected by way of smoking and cotton dust exposing For example, abnormalities inthe maximum expiratory emanates at 50 percent and 25 percent of vital capacity (Vmax50 and Vmax25) are more related to smoking than to cotton events whereas for the forced vital capacity (FVC) and the forced expiratory contortion in one second ([FEV.sub.1]), cotton weights are at least, if not more, important than smoking effects

Differences in the relative importance of lung function parameters in various respiratory diseases may alter the configuration of the maximum expiratory liquefy volume (MEFV) curve. [9,10] Further, authors in the same state [i]or[/i] condition as [Mead.sup.10] demonstrated that the shape of the MEFV 1 may be important in characterizing lung dysfunction. freshly we studied a new parameter, angle [beta], which can be derived from standard arises and volumes, and which cogitates the configuration of the MEFV crook [12] To better distinguish smoking and cotton issues in cotton textile workers, we analyzed angle [beta] in a cohort of previously studied textile workers and in a community-based check group.

MATERIAL AND METHODS

In 1973 we examined a dispose of cotton textile workers who had worked in common of four mills in Columbia, SC Cardroom and weaverroom workers who had worked in the mills for at least three years by means of 1946 formed an initial cogitation group. Workers who had worked three years through 1955 formed a second cluster that included workers in other areas of the mill as well as those in the cardroom or weaveroom. mostly of these workers had more than 20 years of prospect in the cotton textile industry with an average fulness of exposure of 35 years. Details of the selection proces have been described elsewhere. [5] In brief, eligible workers were identified from company personnel records and membership lists obtained from the local union. Of those workers in the initial assemblage (employed three years before 1946) who could be traced, through 95 percent participated, suggesting that the population studied is representative of the surviving population of cotton textile workers. Workers in the other group were obtained in a les systematic way, on the other hand the two groups have been shown not to differ in space of times of their respiratory symptoms or lung function and were, therefore, collection of standing watered for our analysis. [5] The 477 cotton textile workers, age 45 years or older who either at no time smoked or were current cigarette smoker indite the group of cotton workers used in this analysis.

A check population of residents from Lebanon and Ansonia, Conn as well as Winnsboro, SC was studied from 1972 to 1974 [411] All human frames in the control population who had worked in a cotton textile mill for from one side of to the other one year were excluded from this analysis. Previous analyses of our data documented that the residents of Connecticut had prevalence of respiratory symptoms and lung function similar to those of Winnsboro, a community near Columbia. This finding intimates that the Connecticut control subdues as well as those in southern carolina were appropriate for comparison with our cohort of cotton textile workers. The 932 community residents, age 45 years and older who were either none smokers (lifetime nonsmokers) or rife (cigarette) smokers compose the clump of controls used for this analysis.

reviews were conducted in a standardized manner using trailers equipped with computer facilities for recording answers to a questionnaire onward respiratory health and for collecting the eventuates of pulmonary function tests. [13] Standard pulmonary function parameters were recorded from maximal expiratory proceed volume curves, FVC, [FEC.sub.1], the ratio [FEVsub1/FVC] the peak liquefy rate (PEFR), and Vmax50.

A lung function parameter was defined as normal if the observ value was within 196 papal court of the predicted value. awaited values for lung function parameters were based forward the prediction equations of Schoenberg and co-workers. [14] A lung function was defined as les than normal if it was les than the predicted value minus 196 diocese It was defined as greater than normal if the observ value was greater than the predicted value plus 196 SEE