Fig. 5

Effect of vitamin C on the length of hospital stay in days. The non-US trials are divided into groups by oral and intravenous vitamin C administration. The US trials are not shown since they found no effect of vitamin C on hospital stay (Fig. 4). The horizontal lines indicate the 95% CI for the vitamin C effect and the square in the middle of the horizontal line indicates the point estimate of the effect in the particular trial. The diamond shapes indicate the pooled effects on the symptoms and their 95% CI