Values found in the literature include 70 mg,per cup of beverage (type of tea and details of steeping unspecified) and 28 mg,44 mg,and 47 mg per cup for black tea in bags (three bands) steeped 1,3,and 5 minutes,respectively.

• 文献中找到的数据有：每杯茶饮料(茶的类型和泡制的细节均未详细说明)中含有70mg咖啡因，(三种牌子)袋装红茶泡1、3、5分钟后，每杯分别含有28mg、44mg、47mg咖啡因。