A  researcher retrieved one year ICU data from the hospital surveillance  system to examine if exposure to ventilator is a risk factor for  development of pneumonia among patients admitted in ICU. He found the  following information (arbitrary): Total1000 patients were admitted in  ICU in which 350 had exposure to ventilator. Total 300 patients  developed pneumonia, in which 180 patients had ventilator exposure.

1. Identify the study design for which the data was collected. (0.5 grade)

2.  Based on the study design selected in Q1. Calculate appropriate  measure. (Correct selection of measure 0.5 grade, correct formula 0.5  grade, and correct result 0.5 grade)

3. Write the interpretation of your findings. (1 grade)

4. Write 2 strength and 2 limitation of the study design selected in Q1.  (2 grades)