SCENARIO: 1236 Marine recruits entered training during one week in June. Marine recruits are medically examined and must be injury and illness free before beginning training. 112 refused to participate in a study to follow them during 12 weeks of training for the development of stress fractures. All recruits who consented to participate (everyone but those who refused to participate) were successfully followed for all 12 weeks. During the 12 weeks, 55 recruits developed a stress fracture. Of these 55, 26 subjects suffered stress fractures in the first 6 weeks and each of these 26 were fully recovered within 5 weeks. The shortest recovery time among those suffering stress fractures after week 6 was 7.5 weeks. At the beginning of training it was determined that 20% of participants were classified as being in "poor physical fitness." The remaining recruits were in "better than poor physical fitness." The incidence of stress fractures in the poor physical fitness group was 9.8%. Create a 2X2 table if 'poor physical fitness' is your primary exposure and 'stress fracture' is your primary outcome. You are wanting to assess the relationship between poor physical fitness and having a stress fracture. Outcome No Outcome Exposed b atb = w fill in the blank box Not Exposed d c+d = x fill in the blank box atc = y fill in the blank b+d =z fill in the blank box box