A total of 350 patients (N=175 control group; N=175 intervention group) were randomized to receive standard bathing with soap and water daily or chlorhexadine bathing every other day to determine if there was a reduction in hospital acquired infections. Compared with soap and water bathing, intermittent chlorhexidine bathing decreased the risk of hospital acquired infection by 44% (Hazard ratio = 0.55; 95% Confidence Interval (CI) 0.30-0.99; p=0.05). what are the independent and dv variable