Yet, it is not certain that their items give rise to the same performance in various groups under study.
Yet, one cannot always be sure that the test items measure the same constructs in the groups under study.
The comparison of population means was done using "Z" test to compare the prevalence of malocclusion and malocclusion traits between the two groups under study.
The Welch's Student-t test was used when the Levene test revealed heterocedasticity of variances for the groups under study (p < 0.05).
In nonrandomized intervention studies unequal distribution of patient characteristics in the groups under study may hinder comparability of prognosis and therefore lead to confounding bias.
In other groups, even when fossils are known, precise taxonomic assignments may be challenging such groups may not be the best subjects for biogeographic (and phylogeographic) studies anyway, particularly if the groups under study are ancient (Lieberman 2000b , 2002.
These results were obtained after considering the effect on the parent and child outcomes of two socio-demographic factors that showed differences among the groups under study: single parenthood and working at home.
Non-parametric Kruskal-Wallis tests, followed by multiple comparisons between pairs of group medians using Bonferroni significant differences (BSD), were applied to determine if soil texture heterogeneity, measured using the BEI, significantly varied between the lithological groups under study.
Open image in new window Fig. 9 Scatter plot for ΔCt of S1PR1 expression in individual rats in the five rat groups under study Open image in new window Fig. 10 Expression fold change of S1PR1 in rat groups: carrier (compared to untreated), DMBA (compared to carrier), DMBA with plants (compared to carrier), and plant mixture (compared to DMBA).
Their partners, with whom most had had a relationship for decades, were included as environmentally matched controls, thereby minimizing environmental differences between the groups under study.
We confirmed that this is indeed the case for the ortholog groups under study.
