From: Implementing the World Mental Health Survey Initiative in Portugal – rationale, design and fieldwork procedures
Region
Size of number of inhabitants in the localities (PSU)
Less than 2,000
2,000 – 9,999
10,000 – 19,999
20,000 – 99,999
100,000 or more
North
54
9
16
19
2
Centre
46
4
6
1
Lisbon
12
11
17
15
Alentejo
8
Algarve
Total
256