Say like you state in your introduction the following:
This part will examine the demographic reality and the cultural habits of X people in Y country.
In the body of your work, you elaborate with citations:
X people are characterized by a habit of doing A, B and C (Smith 2010, p. 1). They are a population of 100000 (Smith 2010, p. 2), whatever.
Is it required to backup the introduction statement with the same citations? isn't it just a general statement? In case where the 'general statement' (which supposedly doesn't need citations) was inspired by the actual cited study, shouldn't I back it up even if written in a general form?
My question was inspired from this.