3 ms·A lot of the world drinks espresso. Mg of caffeine probably the appropriate measure here?by bufferout 4y agoA lot of the world drinks espresso. Mg of caffeine probably the appropriate measure here?stubish 4y agoIt is a study on self reported data. They won't know how strong the coffee was, or even the size of the cup. Or if the teaspoons of sugar were heaped or flat.krageon 4y agoIt is not, because the study also looked at decaffeinated coffee.