Table 1: Territorial distribution of sample units.

Territorial area n. %
North-West 625 25.0
Torino 300 12.0
Milano 325 13.0
North-East 450 18.0
Bologna 225 9.0
Padova 225 9.0
Centre 600 24.0
Firenze 250 10.0
Roma 350 14.0
South-Islands 825 33.0
Bari 275 11.0
Napoli 275 11.0
Palermo 275 11.0
Total 2500 100.0