one of the most important organ systems is cardiovascular that it 's disorders specially ischemic heart diseases can cause disability or death .
some people specially workers who work in special industries are more in the risk of same disorders .
there were many studies work on workers health but there were some of them , study on cardiovascular system because these disorders have more than one etiology and one of the modifiable risk factors or etiology is work exposure . according to these realities ; cardiovascular disorders risk factors were assessed and measured such as triglyceride , total cholesterol , low density lipoprotein ( ldl ) , high density lipoprotein ( hdl ) , blood pressure , obesity , smoking , genetic . also shift work , stress , carboxi hemoglobin ( cohb ) , solvents , noise , vibration , temperature of environment , air pollution
can find the high risk personnel with non occupational and occupational risk factors of cardiovascular disorders .
exposure to fumes , solvents , additives and drugs , carbon monoxide , carbon disulfide , pesticides , heavy metals , cold or warm environment , air pollution , vibration and noise can cause occupational cardiovascular disorders
had demonstrated work as a farmer , have a heavy and manual work , exposure to noise and some physical or chemical were cardiovascular disorders risk factors .
ghiasvand et al . in their study had shown that work in rail road industry was a risk factor and can cause hyper low density lipoprotein , specially in workers who had shift work . in study of national heart , lung , and blood institute had been shown that the work in tunnel can cause exposure to carbon monoxide and other study on foundry workers can cause the same exposure .
kim et al . in other study had demonstrated that work in refrigerated industry was not a risk factor but workers who work in cold place and environment had diastolic blood pressure in more amount , it was in comparison between exposure to cold and non exposure to it .
had shown that work as a engine driver had cardiovascular risk factors , because they had more hypertension and hyperlipidemia than control group .
kang et al . in their study had found that work in companies and related job mental stress specially in the background of decision making it was related to amount of cholesterol and triglyceride , in the background of demands of work these were related to systolic blood pressure .
chin - ming lin et al . had demonstrated that medical technicians had more hypertensive disorders than other healthcare workers .
also kim had shown the relationship between cold exposure and increasing of blood pressure or hypertension .
the objective of this study was comparison of cardiovascular risk factors between workers in different industries of iran .
this study was performed in khorasan razavi and tehran industries in 2007 - 2011 , workers who divided to three groups ; automobile industry who work in production saloon , food industry and light works such as office worker , administrative , healthcare , sanitary workers . in a cross - sectional study with simple randomized sampling method workers had been selected . with  = 0.05 ,
 = 0.80 , p = 25% population were at least 150 person in each group from 10 factories of automobile , food industries and light work .
this study has been done by completing checklist from medical issues of workers . for validity and reliability of research tool ; checklist have been written and improved in educational department with professors opinions , it had pilot study with correlation coefficient of 85% and it have been used .
data were gathered from medical issues because all workers had periodic physical and paraclinic examinations such as blood pressure blood sampling for triglyceride , total cholesterol , low density lipoprotein , high density lipoprotein , fasting blood sugar , age , body mass index , work duration , smoking , shift work .
inclusion criteria was at least three year work duration in the same industries and exclusion criteria were previous cardiovascular disorders or dyslipidemias .
three groups had been observed for age , work duration , body mass index , shift work .
data were gathered in spss 11.5 and analyzed for calculation of frequency , mean , anova for quantitative variables , chi-2 for qualitative variables and multi nominal logistic regression with p < 0.05 . in regression
cardiovascular risk factors such as hypertension , hyper triglyceridemia , hyper cholesterolemia , hyper low density lipoproteinemia ( ldl ) , lower high density lipoproteinemia ( hdl ) , diabetes mellitus , smoking has been analyzed .
this study has been approved by university board , for research ethics ; with oral satisfaction and i told that cumulative data have been used result will be without name of industries .
this study was performed in khorasan razavi and tehran industries in 2007 - 2011 , workers who divided to three groups ; automobile industry who work in production saloon , food industry and light works such as office worker , administrative , healthcare , sanitary workers .
in a cross - sectional study with simple randomized sampling method workers had been selected . with  = 0.05 ,
 = 0.80 , p = 25% population were at least 150 person in each group from 10 factories of automobile , food industries and light work .
this study has been done by completing checklist from medical issues of workers . for validity and reliability of research tool ; checklist have been written and improved in educational department with professors opinions , it had pilot study with correlation coefficient of 85% and it have been used .
data were gathered from medical issues because all workers had periodic physical and paraclinic examinations such as blood pressure blood sampling for triglyceride , total cholesterol , low density lipoprotein , high density lipoprotein , fasting blood sugar , age , body mass index , work duration , smoking , shift work .
inclusion criteria was at least three year work duration in the same industries and exclusion criteria were previous cardiovascular disorders or dyslipidemias .
three groups had been observed for age , work duration , body mass index , shift work .
data were gathered in spss 11.5 and analyzed for calculation of frequency , mean , anova for quantitative variables , chi-2 for qualitative variables and multi nominal logistic regression with p < 0.05 . in regression
cardiovascular risk factors such as hypertension , hyper triglyceridemia , hyper cholesterolemia , hyper low density lipoproteinemia ( ldl ) , lower high density lipoproteinemia ( hdl ) , diabetes mellitus , smoking has been analyzed .
this study has been approved by university board , for research ethics ; with oral satisfaction and i told that cumulative data have been used result will be without name of industries .
results are in three sections , general information , specific information and cardiovascular risk factors from 875 workers of industries .
403 ( 46.0% ) from automobile industry , 166 ( 19% ) from food industry and 304 ( 35% ) from light works had been participated in this study .
in general mean of age , work duration , body mass index , smoking had been calculated .
the mean of age in automobile industry was 34.87  6.19 years old , in food industry was 34.13  8.64 years old and in light works was 31.40  5.70 years old with f = 25.146 and p < 0.001 .
the mean of work duration in automobile industry was 10.37  4.86 years , in food industry was 5.94  2.46 years and in light works was 5.16  1.98 years with f = 117.286 and p < 0.001 .
76 ( 18.8% ) of automobile industry workers were smoker , none of the food industry worker and 11 ( 3.6% ) of light works were smoker . in specific information mean of systolic blood pressure , diastolic blood pressure , triglyceride , total cholesterol , low density lipoprotein ( ldl ) , high density lipoprotein ( hdl ) , fasting blood sugar had been measured . in table 1
these information had been demonstrated and there were comparison of related variables to cardiovascular disorders between industries workers .
comparison of risk factors to cardiovascular disorders between industries workers then number and percent of cardiovascular risk factors such as obesity , hypertension , hyper triglyceridemia , hyper cholestrolemia , hyper low density lipoprotein , lower high density lipoprotein , diabetes mellitus , were determined and compared in table 2 . although the person - time in automobile industry , food industry and light works were 4179.11 , 986.04 and 1568.64 .
according to the results workers of food industry more healthy than other industries for cardiovascular disorders , mean of high density lipoprotein ( hdl ) was more than 63 mg / dl and it was preventive factor . also according to results automobile industry workers had more obesity , hypertension , hyper triglyceridemia , hyper low density lipoprotein , lower the high density lipoprotein , diabetes mellitus . after the regression analysis , hypertension , hyper triglyceridemia , lower high density lipoprotein had significant difference and more in automobile industries .
there were some same results in previous studies , but total cholesterol , systolic and diastolic blood pressure were more in food industry workers but in the normal range .
sancini et al . had demonstrated that exposure to noise and some physical or chemical were cardiovascular disorders risk factors .
had demonstrated that work as a engine driver had cardiovascular risk factors , because they had more hypertension and hyperlipidemia than control group .
ghiasvand et al . in their study had shown that work in railroad industry was a risk factor for cardiovascular diseases and can cause hyper low density lipoprotein and total cholesterol in blood , specially in workers who had shift work .
cardiovascular disorders such as hypertension can cause stroke , heart diseases ,  and had relation to long time disability and out of work . forbidden the smoking , control of temperature were popular advices for managers of industries to have healthy workers .
there were fumes , solvents , stress , heavy metals ,  in automobile industry that affect the cardiovascular system , although were controlled .
in study of national heart , lung , and blood institute had been shown that the work in tunnel can cause exposure to carbon monoxide and other study on foundry workers can cause the same exposure .
but about food industry temperature of environment is more important risk factor , that was controlled in food industries of iran .
the workers in automobile industries had more work duration , older and body mass index .
also light works such as office worker , administrative , healthcare , sanitary workers had more risk factors than food industry workers , that may be had better health with follow up of screening results .
screening of cardiovascular disorders risk factors in all works and industries can helpful and benefit . according to other studies in some industries controls of shift work , stress , noise ,
vibration and chemical exposures are helpful . in this study , after multi nominal logistic regression ; hypertension , hyper triglyceridemia , lower the high density lipoprotein were significant and the most in workers of automobile industry .
automobile industry have a lot of cardiovascular risk factors , these were fumes and other chemicals , physicals , control of them can reduce the risk of occupational cardiovascular disorders , one of the ways to control was engineering method , then administrative and at the end personal protective devices . medical surveillance with periodic examination for
screening of non occupational and occupational disorders , specially risk factors of cardiovascular disorders can be helpful .
screening of cardiovascular disorders risk factors were important and helpful in industries specially automobile industry , that might be preventive method for these disorders in the future .
 background : disorders of cardiovascular system can cause disability or death , screening is necessary specially in workers who maybe had risk factors . 
 hypertension , hyperlipidemia , obesity , smoking , genetic , exposure to chemicals , fumes , solvents , coldness are non occupational and occupational risk factors . 
 objective was comparison of cardiovascular disorders risk factors between workers in different industries of iran.methods:in a cross - sectional study , workers of automobile , food industries and light works had been selected and cardiovascular disorders risk factors had been gathered then data analyzed in spss with one - way anova , chi-2 and multi nominal logistic regression with p < 0.05.results:875 workers had been participated in the study , all of the cardiovascular disorders risk factors were in the normal range . 
 mean of high density lipoprotein ( hdl ) in food industry workers was 63.83  17.42 mg / dl and it was protective , but in workers who work in automobile industry was 38.97  11.08 mg / dl and the lowest , also hypertension and hypertriglyceridemia were more prominent in this industry and after regression with p < 0.05 , the differences were significant.conclusions:screening of cardiovascular disorders risk factors were important and helpful in industries specially automobile industry , that might be preventive method for these disorders in the future . 
INTRODUCTION
METHODS
Study setting
Study design and target population
Checklist design
Statistical analysis
Ethical consideration
RESULTS
DISCUSSION
CONCLUSION