However, subjects were not selected based on their prior complaints about tobacco smoke exposure, and their recorded lost days from work cannot be attributed to bias against any perceived smoke exposure. antibiotic levaquin
Fourth, many studies use diary entries collected for a single day or up to 90 days or more. In this study, the subjects faithfully recorded their information for a full nine months, thus minimizing sampling error.
Finally, both genders were tested, all subjects were randomly selected from cadres and passive smokers were age- and gender-matched to nonsmokers. Because of financial constraints, the number of subjects was limited to 100.
Carbon monoxide measures were used because they are inexpensive and are a valid measure of tobacco smoke concentration. Future studies should include measures of either carboxyhemoglobin, cotinine or thiocyanate in blood, saliva or urine.
In our study, CO levels in the work place of nonsmokers were higher than expected, indicating contamination of the refiltered air carried from other parts of the building. Because ventilation systems are designed to recirculate air, not to filter out particulate matter, they are often responsible for bringing polluted air from smoking areas into designated “smoke-free” areas.