In July 2010, a cross-sectional tuberculosis health risk survey was conducted in several homeless shelters in Washington, DC Area. One of the objectives of the survey was to estimate the prevalence of both tuberculosis (TB) and illegal drug (ID) use among the residents of the homeless shelters.In the study, 79 of the ID users tested positive for TB (28 women, 51 men). Among the non-drug users, 50 tested positive for TB (15 women, 35 men). Additional data collected from the study are as follows:

	Number of IDUs	Number of Non-IDUs	Number of People Surveyed
Male	85	160	245
Female	46	69	115
Total	131	229	360

Based on the following information from the study above help me answer/understand the following questions.

• What is the overall prevalence of illegal drug use (IDU) in this population? [Calculate]
• Does the prevalence of IDU differ between males and females? Calculate the prevalence separately for males and females and provide an interpretation for your findings. [Calculate and Interpret]
• Discuss whether males or females have the greater burden of ID use in terms of 1) count data and 2) prevalence data. Note that having a greater burden does not necessarily mean that the difference is statistically or clinically significant.[Using Data]
• If you had limited public health resources to spend on programs to reduce the burden of ID use in homeless shelters and could only focus your efforts on one segment of the population, would you target males or females? Justify your choice with data. [Using Data]
• What is the prevalence of tuberculosis among IDUs? [Calculate]
• Is the prevalence of tuberculosis for males higher among IDUs or non-IDUs? Calculate the prevalence separately for male IDUs and non-IDUs and provide an interpretation for your findings. [Calculate and Interpret]