Despite an extensive search, I was unable to find specific information detailing the number of races Alessandro Zampedri retired from in 2002. His career details are generally well-documented, but precise statistics for the year 2002 regarding race retirements are not readily available in the sources found.
If you need detailed race statistics for Alessandro Zampedri or other specific years, consulting specialized motorsports databases, archives, or directly accessing historical race records from event organizers might be necessary. The Indianapolis Motor Speedway driver stats page might also have more granular details.
For a general biography, you can refer to his Wikipedia page.