For each of the following scenarios, identify the subjects, dependent variable, and primary independent variable(s).

1. "Food Safety Knowledge and Behavior of Emergency Food Relief Organization Workers: Effects of Food Safety Training Intervention." Finch, Cristin; Daniel, Eileen., Journal of Environmental Health, May2005, Vol. 67 Issue 9, p30. The food safety knowledge and food-handling behaviors of 267 volunteer and staff workers in emergency food relief organizations in western New York State were assessed before and after food safety training. Training was voluntary and emphasized basic food safety and prevention of foodborne illness.

2. "Food Consumption by Children and the Risk of Childhood Acute Leukemia", Marilyn L Kwan; Gladys Block; Steve Selvin; Stacy Month; Patricia A Buffler Publisher:American journal of epidemiology. 160, no. 11, (2004): 1098 The possible relation between child's early diet and risk of childhood leukemia has remained largely unexplored. The authors' objective was to determine what particular foods consumed early in life (first 2 years) are associated with risk of childhood leukemia in a study of a diverse California population. Dietary data were obtained from a questionnaire administered to the child's caregiver. Regular consumption of oranges/bananas and orange juice during the first 2 years of life was associated with a reduction in risk of childhood leukemia diagnosed between the ages of 2 and 14 years. No association between eating hotdogs/lunch meats and risk of leukemia was found. These results suggest that fruits or fruit juices that contain vitamin C and/or potassium may reduce the risk of childhood leukemia, especially if they are consumed on a regular basis during the first 2 years of life.

3. "Occupational Exposures and Asthma in 14,000 Adults from the General Population", Nicole Le Moual; Susan M Kennedy; Francine Kauffmann, American journal of epidemiology. 160, no. 11, (2004): 1108. The association of asthma with occupational exposures was studied in 14,151 adults, aged 25-59 years. Exposures to 18 asthmagenic agents were estimated by an asthma-specific job exposure matrix. Risks associated with asthma increased when considering jobs or specific agents, such as industrial cleaning agents, latex, flour, highlyreactive chemicals, and textiles.