is population who are exposure to rice dust more years cause to % of respiratory illness were higher population who are having less than 5 years exposure are having only 15.38% morbidity where as those who are having more than 20 years of exposure it was 50% but duration of exposure not related to the control.Table 3 distribution of various symptoms among the study population exposure group have % disorder symptoms of respiratory more than control group. This table too
and If you look at Table 2 you can see duration of exposure to rice dust even more exposure group have respiratory illness more ,when comparision between exposure group and control group you can see exposure group have respiratory illness more than control group. From 2 table show that duration of employment and respiratory symptoms there is a significant correlation.