We can conclude from this comparison, that population in eastern part of Finland was sick as regard their excessively high level of cholesterol. Experience from Finland in the framework of the North Karelia project shows that dietary changes are possible at the population level. The risk of coronary heart disease is linear according to the cholesterol level. This is important when assessing the justification of the population approach in lowering the cholesterol level among societies. The best way really influencing is to shift the curve to the left parallel with taking care of those who are already hypertension patients.
Sociological argument is based on the concept that society is an entity.
If you want to change the behaviour of the masses of people, the support of change and eg. Moral argument comes from the concept, that there is collective responsibility in society. Medical arguments rise from the fact that medicine alone cannot do very much for the population as the whole. Actually medicine plays minor role in population approach as already experienced in the control of infectious diseases. Because underline causes are behavioural, need of assistance and collaboration with different disciplines are essential.