Obvious questions * Is this effect of "0.23% TI" significant? * what about other roasts? * what happens if the initial period of 4 weeks with no caffeine or

Obvious questions * Is this effect of "0.23% TI" significant? * what about other roasts? * what happens if the initial period of 4 weeks with no caffeine or the 4 weeks with coffee are shorter or longer? * What happens if the test is done with people who had low or no previous consumption of caffeine? With old or young people?