CONTROL INFORMATION (to be filled out from the existing information, except for a4c )
Categories
Value
Category
1
Severozapaden
2
Severen tsentralen
3
Severoiztochen
4
Yugozapaden
5
Yuzhen Tsentralen
6
Yugoiztochen
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.