Background The aim of this study was to evaluate the anxiety and depression in women with infertility. MaterialsAndMethods A case control study was carried out on 150 subjects with infertility and on 150 subjects with tubal ligation. The two groups were matched in demographic and personal characteristics. Data collection tool was a questionnaire including questions regarding demographic and obs...

Deterrence studies have shown that perceived sanction risk is related to delinquent behaviour, independent of other variables, and that this relation may be conditioned by individual propensity towards crime. The principal goal of this study is to assess these findings with data from a sample of 843 Dutch adolescents. First, we analysed whether perceived sanction risk (perceived apprehension ri...

The purpose of this article is to present in elementary mathematical and statistical terms a simple way to quickly and effectively teach and understand case-control studies, as they are commonly done in dynamic populations-without using the rare disease assumption. Our focus is on case-control studies of disease incidence ('incident case-control studies'); we will not consider the situation of ...

A dense set of single nucleotide polymorphisms (SNP) covering the genome and an efficient method to assess SNP genotypes are expected to be available in the near future. An outstanding question is how to use these technologies efficiently to identify genes affecting liability to complex disorders. To achieve this goal, we propose a statistical method that has several optimal properties: It can ...

Classic (or ‘‘cumulative’’) case-control sampling designs do not admit inferences about quantities of interest other than risk ratios and then only by making the rare events assumption. Probabilities, risk differences, number needed to treat, and other quantities cannot be computed without knowledge of the population incidence fraction. Similarly, density (or ‘‘risk set’’) case-control sampling...

It is now generally accepted, as pointed out by Westgate (1945), that the pineapple mealybug, Pseudococcus brevipes (Ckll.), is present in Florida, causing wilt as in other, pineapple growing areas. Control of the pine apple mealybug and/or of the ants infesting the soil and plants is, furthermore, usually considered to effect control of the wilt of pineapples, as shown by Illingworth (1931). B...

Background The aim of this study was to compare sexual function between women of infertile couples and women who have undergone TL. MaterialsAndMethods In this case control study in Royan Institute and in a health center in Gilan province (Iran), between 2013 and 2014. There were 150 infertile women (cases) and 150 women undergoing TL (controls). A questionnaire was completed for each patient. ...

Cohort and case-control methodologies are the main tools for analytical epidemiological research. Other important types of epidemiological studies mainly for generating hypotheses include cross-sectional and ecological, or correlation studies. The conclusions that can be drawn from findings of these types of studies are, however, much weaker compared to those of cohort and case-control studies....

A new era of automatic train control has begun, in which mass transit trains will be commanded with precision beyond the capabilities of past systems. Although transit properties such as San Francisco's Bay Area Rapid Transit (BART) have controlled their trains automatically for decades, the control systems have limited capability. Increases in capacity now require trains to run closer together...