Tea consumption was measured using a standard container (350-ml tea cup) during the interviews. The use of teapots and small cups in other parts of China is not popular among Zhejiang residents (whose average cup size being 300–350 ml). The common method is to brew dry tea leaves in a cup using hot water without milk and sugar. The amount of dry tea leaves used depends on individual preference, but usually varies between 2 and 4 grams. Each new batch of tea is typically brewed once or twice for personal consumption. Therefore, it is appropriate to quantify tea consumption by counting the number of cups brewed from each new batch of tea. For infrequent tea drinkers and those reported drinking less than one cup at a time, their actual tea consumption was recorded instead.