highly significantp < 0.001
Cochran’s Q test was highly significant for bilirubin ( Q = 44,447; df = 20; p < 0.001), infection ( Q = 77.5, df = 19, p < 0.001) and “other” ( Q = 69.91, df = 11, p < 0.001) demonstrating that the observed variation in effect sizes exceeds that expected by chance alone and the I 2 statistic approached 100% (bilirubin), 81% (infection), 97% (other).