Answer:
1. heart disease
2. Health-wealth gradient
Explanation:
The Whitehall study was a series of research performed on British Civil Servants to investigate the effect of social factors on health. Whitehall study 1 found that men who were in the lower grade of employment, succumbed easily to coronary heart disease unlike the men in the higher grades.
According to the researchers, the difference in health between the affluent, middle class, and poor is called health-wealth gradient.