The Pearl Index is the value used in the medical sciences to rate the effectiveness of a birth control method. It refers to the number of unwanted pregnancies in 100 couples using any given method for the duration of one year.
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... Manuel Fangio, (Argentina)
1955 - Maurice Trintigant[?], (France)
1956 - Stirling Moss, (United Kingdom)
1957 - Juan Manuel Fangio, (Argentina)
1958 - Maurice ...