The predictive value of HZA has been extensively investigated in terms of IVF outcome and the sum of the studies included in this review served to validate this assay as a predictor of fertilizing capacity [ 37– 437.
A previously published review and meta-analysis [ 61] explored various sperm function tests in a similar manner, although this group did not include the sum of the studies reported here and no direct comparison was performed between these two tests to clarify their definite validity on male fertility investigation.
For statistical analyses we used the summed individual numbers of the four surveys, whereby each survey contains the sum of the five study plots (either at the field edge or the field centres).
Thus, each summary relative risk was a weighted average of the study-specific relative risk, where the weight for each study is the inverse of the sum of the within-study variance for that study, and the between-study variance.
Random effects calculations were implemented with the inverse variance approach, considering the sum of the within-study plus between-study variance.
The sum of the drawn study scores determines the score for a virtual gene.
For these calculations, a random-effects model was applied and this implied to weight each effect size by its inverse-variance, with the variance defined as the sum of the within-study and the between-studies variances [ 38].
Collectively, the sum of these studies suggest that Yae1-Lto1 largely increase the efficiency of Rli1 maturation, in particular under aerobic conditions, yet in the absence of oxygen these factors can be bypassed to some extent without losing cell viability.
The estimator of the pooled exposure effect is a weighted average of the individual study estimators, weighted by the inverse marginal variances; the marginal variance is the sum of the individual study-specific variances and the variance of the random study effects.
19, 21 The sum of these studies suggests that HbA1c is associated with prevalent retinopathy, but there is no evidence of a consistent threshold.
