Standardized difference scores are intuitive indexes which measure the effect size between two groups. Compared to a t-test or Wilcoxon rank-sum test, they are independent of sample size. Thus, their use can be recommended for comparing baseline covariates in clinical trials as well as propensity-score matched studies. In this paper, we show how to calculate sample standardized differences for ...

Methods A 15-years (1997-2012), prospective, population-based study was then carried out to determine the incidence of JIA. Prospective and retrospective data retrieval was performed to calculate prevalence. The International League of Associations for Rheumatology (ILAR, Edmonton revision) classification criteria were applied. Data were compared by Chi-square, student t or wilcoxon test. Signi...

ABSTRACT The van Elteren test, a popular extension of the Wilcoxon rank sum test for comparing two treatments in a stratified experiment, uses within-stratum ranks and assigns larger weight to rank sums from smaller strata. It performs well if the treatment effect is constant across strata, but it can be grossly inefficient otherwise. Existing alternatives to the van Elteren test include tests ...

BACKGROUND Most HIV-1-infected patients on effective antiretroviral therapy (ART) with plasma HIV-1 RNA levels below the detection limits of commercial assays have residual viremia measurable by more sensitive methods. We assessed whether adding raltegravir lowered the level of residual viremia in such patients. METHODS AND FINDINGS Patients receiving ART who had plasma HIV-1 RNA levels below...

OBJECTIVES Osteophytes are products of active endochondral and intramembranous ossification, and therefore could theoretically provide significant efficacy as bone grafts. In this study, we compared the bone mineralisation effectiveness of osteophytes and cancellous bone, including their effects on secretion of growth factors and anabolic effects on osteoblasts. METHODS Osteophytes and cancel...

background: coronally advanced fl ap (caf) has been shown to effectively treat gingival recession. platelet rich plasma (prp), containing autologous growth factors, has been shown to promote soft tissue healing. the aim of this clinical study was to determine whether the addition of an autologous prp to a caf when compared to a caf alone would improve the clinical outcome for treatment of multi...