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本文报导了1973～1974年冬季在南威尔斯的688名年轻妇女中进行的每天1g维生素C(V_c)预防呼吸道感染的随机对照试验。试验对象是居住在南威尔斯二个城市的妇女,她们均在前两年内分娩过,要求她们暂不再怀孕且能合作。其中339名每天服用1g V_c,349名每天服用1g安慰剂作为对照组,共一百天。每人发给记录卡,记录试验期间所出现的任何呼吸道症状,每月检查一次卡片。呼吸道症状的分类: 单纯感冒(simple cold)——流涕、喷嚏、咽喉痛或有发热、头痛、不适。重感冒(chest cold)——咳嗽或伴有其他胸部症状。若两次发病仅间隔1～2天无症状,算一次感冒;
This article reports a randomized controlled trial of 1 g vitamin C (V_c) daily for the prevention of respiratory tract infections in 688 young women in South Wales during the winter of 1973-1974. The subjects were women living in two cities in South Wales, both of whom had given birth within the previous two years, requiring them to become pregnant and cooperate again. Among them, 339 patients took 1g V_c daily and 349 patients took 1g placebo daily as control group for a total of 100 days. Each person is given a record card to record any respiratory symptoms that occur during the test and to check the card once a month. Classification of respiratory symptoms: simple cold - runny nose, sneezing, sore throat or fever, headache, discomfort. Chest cold - Cough or other chest symptoms. If the incidence of only 1 to 2 days intervals asymptomatic, considered a cold;