Findings from the meta-analysis on total water intake and
all-cause mortality:
Six cohort studies investigated the association between total water
intake and risk of all-cause mortality[5, 6, 14-16,
19]. These studies included a total of 115815 participants, among
them 14250 deaths occurred. The summary effect size for all-cause
mortality comparing the highest and lowest intakes of total water was
0.95(95% CI: 0.83-1.09, P=0.47), indicating no clear significant
association between total water intake and risk of all-cause mortality
(Figure 2 ). However, significant between-study heterogeneity
was seen (I2 = 66%; P=0.002).