Fig. 7

Effect of vitamin C on the length of ICU stay. The US and non-US trials are separated in this figure. The durations of ICU stay were transformed to the relative scale; thus the duration in the corresponding placebo group was given a value of 100%. Thereby the difference between the vitamin C and control groups gives the effect of vitamin C directly as a percentage. 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