Table 1: Incidence of endpoints between both the PEA and the placebo groups.

Study (year)PEA ( )Placebo ( )% ProtectionSignificance ( )

Masek (1972a) [14]22322145% 0.05
Masek (1972b) [14]43646332% 0.0005
Kahlich (1973) [14]43646534% 0.0002
Kahlich (1974) [14]41119952% 0.002
Kahlich (1975) [14]23511859% 0.004
Plesnik (1977) [15]19622416%NS