Zenkai in Saiyans:
33 times (extremely rare)
10 to 5 times (rare)
5 to 2.5 times (normal)
2.5 to 1.1 times (common)
"Zenkai" Triciclops (Tien):
28 times (extremely rare)
9 times (rare)
4.5 times (normal)
1.7 times (common)
"Zenkai" Legendary superhuman (Yamcha):
30 times (extremely rare)
15 to 10 times (rare)
10 to 2 times (normal)
2 times to 1.2 (common)