> - Were coffee preparation methods at all considered? I don't know if everyone in the trial was being served the same coffee or if respondents prepared coffee

> - Were coffee preparation methods at all considered? I don't know if everyone in the trial was being served the same coffee or if respondents prepared coffee in whatever manner they liked and just reported how much coffee/how sweet they made it. It was not a controlled trial, it's an observational study. They had a few hundred thousand people fill in a questionaire (up to 5 times in different seasons) about their diet (sweetened/unsweetened/type of coffee consumption were only a few of the many questions). They registered the answers and compareed a few years later how many died, with statistical controlls for different observed characteristics between drinkers and non-drinkers. Full details: https://roar-assets-auto.rbl.ms/documents/16093/Sweetened%20and%20Unsweetened%20Coffee.pdf https://roar-assets-auto.rbl.ms/documents/16093/Sweetened%20...