Caffeine content varies between 0.7 % and 1.7 % of dry weight ( compared with 0.4 - 9.3 % for tea leaves , 2.5-7 .6 % in guarana , and up to 3.2 % for ground coffee ) ; theobromine content varies from 0.3 % to 0.9 % ; theophylline is present in small quantities , or can be completely absent .
Caffeine content varies between 0.3 % and 1.7 % of dry weight ( compare this to 2.5-4 .5 % for tea leaves , and 1.5 % for ground coffee ) .