“…Length of hospital stay and age have been explored in many studies, but the type of data reported varied widely across studies. (4,11,30,34,35) reported the medians and quartiles, while Crispo et al and Lee et al (12,36) performed subgroup comparisons. The same was true for age, with means and SD (4,5,7,17,18,22,28,30,34), medians and quartiles (11,35), and subgroup comparisons (12,18,29,33,36) being reported in different articles, which proved problematic in allowing us to obtain accurate quantitative results via meta-analysis.…”