Some authors have demonstrated no correlation between stiffness and the type of surgical approach used, especially regarding the posterior approach [18].
Three of these studies however were only intuitive because of the impact of one outlying hospital, and therefore would have demonstrated no correlation between quality of care and mortality if the outlier hospital was excluded [ 51, 59, 62].
Although it is recognized that embryo morphology grading is only a weak predictor of clinical outcome, one study has found a positive relationship between serum AMH after stimulation and embryo morphology (Silberstein et al., 2006), while others have demonstrated no correlation between basal serum AMH and embryo quality (Ebner et al., 2006; Smeenk et al., 2007; Lie Fong et al., 2008).
Much research has demonstrated the correlation between poverty and obesity: the healthiest foods are often the most expensive.
Previous research has demonstrated a correlation between DP and mechanical properties such as tensile strength and fold endurance [16].
The MTA scale has demonstrated significant correlation with manual measurements of the hippocampus, and increased clinical relevance when seen in association with cognitive function [23].
Furthermore, Atkinson [17] has demonstrated a correlation between MCTs and biological motion processing in adults with ASC, which was also observed in adolescents recently [20].
This study has demonstrated a correlation between herd size and COD occurrence.
Research in North America and Europe has demonstrated the correlation between environmental determinants and physical activity levels and food consumption patterns (13).
Previous work has demonstrated a correlation between mutation rate and replication timing (Agier and Fischer 2012; Lang and Murray 2011).
Finally, one study has demonstrated a correlation between death from peptic ulcer disease and exposure to air pollution [ 32].
