Table 2. Mean number of children (±SD) according to P53 genotype. The number of subjects is given in brackets.

P53 genotype	Southern Italy	Northern Italy
Pro/Pro	3.6±2.2(11)	0.75±1.0 (4)
Pro/Arg	3.6±2.1 (30)	1.67±0.9 (21)
Arg/Arg	3.7±2.6 (50)	1.95±1.0 (38)
p	0.98	0.056