date:Jun 22, 2012
its results.
For example, it notes that information on tea consumption and other lifestyle factors was only collected at the start of the study.Given the average follow-up was 28 years, it is unlikely that tea drinking habits, and other behaviours such as alcohol and smoking levels, remained stable over this entire period. This could have affected the results.
Study details
The collaborative study began in Scotland in 1970 and gathered data from more than 6,000 male volunteers, all between 21