British study. We can infer instant coffee was the main preparation recorded in the study, which has a lower caffeine content than fresh brewed. ~70-120mg look

British study. We can infer instant coffee was the main preparation recorded in the study, which has a lower caffeine content than fresh brewed. ~70-120mg look like drip brew numbers. Instant tends to run from 30-50mg. 25 cups of instant == ~750-1250mg