9-6 In general, levels of the hormone testosterone decrease during periods of stress. Because physical and psychological stressors are inevitable in the life of soldiers, the military is very interested in assessing stress response in soldiers. Many studies addressing this issue suffer from taking place in a laboratory setting, which may not accurately reflect the real world stresses on a soldier. To investigate the effects of stress on testosterone levels in a more realistic setting, Charles Morgan and colleagues* measured salivary testosterone levels in 12 men before and during a military training exercise. The exercise included simulated capture and interrogation modeled on American prisoner of war experiences during the Vietnam and Korean wars. Table 9-11 shows their data. What conclusions can be drawn from these observations?