The dose-response relationship for asbestos exposure in a chrysotile product factory was studied. The past gravimetric dust concentration values, obtained from different worksites, were converted into fiber concentrat...The dose-response relationship for asbestos exposure in a chrysotile product factory was studied. The past gravimetric dust concentration values, obtained from different worksites, were converted into fiber concentration values according to conversion factors that were worked out by simultaneous sampling in this study. The conversions were made so that exposure could be expressed in fiber-years (f-yr). Asbestosis was diagnosed on the basis of chest radiographs and occupational histories. Cumulative dust exposure (f-yr) was calculated up to the date of diagnosis for asbestosis patients, and up to September 1982 for the remaining workers. A dose-response relationship expressed as fiber-years exposed vs cumulative prevalence of asbestosis was established by the life table method on the basis of these data. Predicted 3 and 1% prevalence of asbestosis corresponded to 43 and 22 f-yr exposure, respectively. Considering that a worker can work for 35 years, these doses are commensurate with dust concentrations of 1.22 and 0.63 f/ml, respectively. It is recommended that 1 f/ml be taken as the maximum allowable concentration of airborne asbestos dust for the workplace with an anticipated prevalence of about 2% asbestosis after 35 years of exposure. 1990 Academic Press, Inc.展开更多
Objective:To identify the prevalence,determinants of reproductive tract infection,and healthcare seeking behavior among ever married women of reproductive age residing in an urban slum of Faridabad,Haryana,North India...Objective:To identify the prevalence,determinants of reproductive tract infection,and healthcare seeking behavior among ever married women of reproductive age residing in an urban slum of Faridabad,Haryana,North India.Methods:This community based cross-sectional study was conducted among ever married women aged between 15 and 49 years insured under employees state insurance scheme and residing in an urban slum of Faridabad.Simple random sampling technique was used to interview 149 eligible women using a predesigned structured questionnaire.Study variables included sociodemographic profile,family planning methods,menstrual absorbent usage,and symptoms of reproductive tract infection.Binary logistic regression was used to investigate the determinants of reproductive tract infection.Results:Of the women,46.3%had at least one reproductive tract infection or sexually transmitted infection symptom and 28.9%among them sought treatment for the symptom.Vaginal discharge,itching(14.1%)and lower abdominal pain(30.2%)were the major symptoms reported.Non-usage of condoms as contraceptive was significantly associated with a higher rate of symptoms(50.4%vs.20.0%).Abortion had a significantly high odds of having reproductive tract infection symptoms(aOR 3.71,95%CI 1.59-8.62;P<0.01).Less frequent change in absorbent during menstruation was also reported to have a higher rate of symptoms.The majority of those who took treatment sought it from government or employees state insurance dispensary.2%also went to faith healers.Conclusions:Nearly half of the study population have reproductive tract infection symptom.Abortions and non-usage of condom increase the risk of reproductive tract infection.Menstrual hygiene and condom usage are the significant interventions,which may reduce the prevalence of these symptoms.展开更多
文摘The dose-response relationship for asbestos exposure in a chrysotile product factory was studied. The past gravimetric dust concentration values, obtained from different worksites, were converted into fiber concentration values according to conversion factors that were worked out by simultaneous sampling in this study. The conversions were made so that exposure could be expressed in fiber-years (f-yr). Asbestosis was diagnosed on the basis of chest radiographs and occupational histories. Cumulative dust exposure (f-yr) was calculated up to the date of diagnosis for asbestosis patients, and up to September 1982 for the remaining workers. A dose-response relationship expressed as fiber-years exposed vs cumulative prevalence of asbestosis was established by the life table method on the basis of these data. Predicted 3 and 1% prevalence of asbestosis corresponded to 43 and 22 f-yr exposure, respectively. Considering that a worker can work for 35 years, these doses are commensurate with dust concentrations of 1.22 and 0.63 f/ml, respectively. It is recommended that 1 f/ml be taken as the maximum allowable concentration of airborne asbestos dust for the workplace with an anticipated prevalence of about 2% asbestosis after 35 years of exposure. 1990 Academic Press, Inc.
文摘Objective:To identify the prevalence,determinants of reproductive tract infection,and healthcare seeking behavior among ever married women of reproductive age residing in an urban slum of Faridabad,Haryana,North India.Methods:This community based cross-sectional study was conducted among ever married women aged between 15 and 49 years insured under employees state insurance scheme and residing in an urban slum of Faridabad.Simple random sampling technique was used to interview 149 eligible women using a predesigned structured questionnaire.Study variables included sociodemographic profile,family planning methods,menstrual absorbent usage,and symptoms of reproductive tract infection.Binary logistic regression was used to investigate the determinants of reproductive tract infection.Results:Of the women,46.3%had at least one reproductive tract infection or sexually transmitted infection symptom and 28.9%among them sought treatment for the symptom.Vaginal discharge,itching(14.1%)and lower abdominal pain(30.2%)were the major symptoms reported.Non-usage of condoms as contraceptive was significantly associated with a higher rate of symptoms(50.4%vs.20.0%).Abortion had a significantly high odds of having reproductive tract infection symptoms(aOR 3.71,95%CI 1.59-8.62;P<0.01).Less frequent change in absorbent during menstruation was also reported to have a higher rate of symptoms.The majority of those who took treatment sought it from government or employees state insurance dispensary.2%also went to faith healers.Conclusions:Nearly half of the study population have reproductive tract infection symptom.Abortions and non-usage of condom increase the risk of reproductive tract infection.Menstrual hygiene and condom usage are the significant interventions,which may reduce the prevalence of these symptoms.
