Investigating Confidence Intervals of Item Parameters When Some Item Parameters Take Priors in the 2PL and 3PL Models.

To reduce the chance of Heywood cases or nonconvergence in estimating the 2PL or the 3PL model in the marginal maximum likelihood with the expectation-maximization (MML-EM) estimation method, priors for the item slope parameter in the 2PL model or for the pseudo-guessing parameter in the 3PL model can be used and the marginal maximum a posteriori (MMAP) and posterior standard error (PSE) are estimated. Confidence intervals (CIs) for these parameters and other parameters which did not take any priors were investigated with popular prior distributions, different error covariance estimation methods, test lengths, and sample sizes. A seemingly paradoxical result was that, when priors were taken, the conditions of the error covariance estimation methods known to be better in the literature (Louis or Oakes method in this study) did not yield the best results for the CI performance, while the conditions of the cross-product method for the error covariance estimation which has the tendency of upward bias in estimating the standard errors exhibited better CI performance.

A note on computing Louis' observed information matrix identity for IRT and cognitive diagnostic models.

Using Louis' formula, it is possible to obtain the observed information matrix and the corresponding large-sample standard error estimates after the expectation-maximization (EM) algorithm has converged. However, Louis' formula is commonly de-emphasized due to its relatively complex integration representation, particularly when studying latent variable models. This paper provides a holistic overview that demonstrates how Louis' formula can be applied efficiently to item response theory (IRT) models and other popular latent variable models, such as cognitive diagnostic models (CDMs).

Global implementation of the world health organization's International Classification of Diseases (ICD)-11: The allergic and hypersensitivity conditions model.

The International Classification of Diseases (ICD) provides a common language for use worldwide as a diagnostic and classification tool for epidemiology, clinical purposes and health management. Since its first edition, the ICD has maintained a framework distributing conditions according to topography, with the result that some complex conditions, such as allergies and hypersensitivity disorders (A/H) including anaphylaxis, have been poorly represented. The change in hierarchy in ICD-11 permitted the construction of the pioneer section addressed to A/H, which may result in more accurate mortality and morbidity statistics, including more accurate accounting for mortality due to anaphylaxis, strengthen classification, terminology and definitions.

Changing the history of anaphylaxis mortality statistics through the World Health Organization's International Classification of Diseases-11.

We review the history of the classification and coding changes for anaphylaxis and provide current and perspective information in the field. In 2012, an analysis of Brazilian data demonstrated undernotification of anaphylaxis-related deaths because of the difficulties of coding using the International Classification of Diseases, 10th Revision. This work triggered strategic international actions supported by the Joint Allergy Academies and the International Classification of Diseases World Health Organization (WHO) leadership to update the classification of allergic disorders for the International Classification of Diseases, 11th Revision (ICD-11), which resulted in construction of the pioneer "Allergic and hypersensitivity conditions" chapter.

Developing an international standard for the classification of surface anatomic location for use in clinical practice and epidemiologic research.

Background: There is currently no universally adopted terminology for defining human surface anatomic location. The lack of precision, accuracy, and reliability of terms used by health care providers, in particular dermatologic surgeons, is unsatisfactory both for epidemiologic research and for high-quality patient care.

Objective: We sought to create a clinically relevant yet concise surface anatomy terminology for international use including the International Classification of Diseases and to map it to existing disparate terminologies.

WITHDRAWN: Interventions for guttate psoriasis.

Background: Guttate psoriasis is a distinctive acute form of psoriasis which characteristically occurs in children and young adults. Very little specific evidence-based guidance is available in standard texts to help make rational decisions about treatment options.

Objectives: To assess the effectiveness of treatments for guttate psoriasis.

WITHDRAWN: Antistreptococcal interventions for guttate and chronic plaque psoriasis.

Background: Guttate psoriasis is a distinctive acute form of psoriasis which characteristically occurs in children and young adults. It is closely associated with preceding streptococcal sore throat or tonsillitis. Some authorities have claimed that ordinary (chronic plaque) psoriasis may also be made worse by infection at distant sites.

Reaching multidisciplinary consensus on classification of anaphylaxis for the eleventh revision of the World Health Organization's (WHO) International Classification of Diseases (ICD-11).

Background: Although currently misclassified in the International Classification of Diseases (ICD) and still not officially listed as a rare disease, anaphylaxis is a well-known clinical emergency. Anaphylaxis is now one of the principal headings in the "Allergic and hypersensitivity conditions" section recently compiled for the forthcoming 11 Revision of ICD (ICD-11). We here report the building process used for the pioneering "Anaphylaxis" subsection of ICD-11 in which we aimed for transparency as recommended in the ICD-11 revision guidelines.

Use of ontology structure and Bayesian models to aid the crowdsourcing of ICD-11 sanctioning rules.

The International Classification of Diseases (ICD) is the de facto standard international classification for mortality reporting and for many epidemiological, clinical, and financial use cases. The next version of ICD, ICD-11, will be submitted for approval by the World Health Assembly in 2018. Unlike previous versions of ICD, where coders mostly select single codes from pre-enumerated disease and disorder codes, ICD-11 coding will allow extensive use of multiple codes to give more detailed disease descriptions.

Collaboration between specialties for respiratory allergies in the International Classification of Diseases (ICD)-11.

Background: The International Classification of Diseases (ICD) has been grouping the allergic and hypersensitivity disorders involving the respiratory tract under topographic distribution, regardless of the underlying mechanisms, triggers or concepts currently in use for allergic and hypersensitivity conditions. In order to strengthen awareness and deliberate the creation of the new "Allergic or hypersensitivity disorders involving the respiratory tract" section of the ICD-11, we here propose make the building process public.

Methods: The new frame has been constructed to cover the gaps previously identified and was based on consensus academic reports and ICD-11 principles.

Assessing psoriasis severity and outcomes for clinical trials and routine clinical practice.

Psoriasis is a complex disease. Dermatologists have not documented psoriasis severity, except in clinical trials; doing so requires tools for assessing psoriasis and an understanding of what changes in those assessments mean in terms of outcome. Two psoriasis assessment tools have dominated: The Psoriasis Area and Severity Index and the Dermatology Life Quality Index.

Responsiveness to change and interpretability of the simplified psoriasis index.

The Simplified Psoriasis Index (SPI) is a summary measure of psoriasis with separate components for current severity (weighted for functionally or psychosocially important sites), psychosocial impact, and past behavior. The current severity components of the professionally assessed SPI (proSPI-s) and self-assessed SPI (saSPI-s) have each been shown to be valid and reliable. Their responsiveness to change and equivalence to the current standard (Psoriasis Area and Severity Index, PASI) were investigated.

The Simplified Psoriasis Index (SPI): a practical tool for assessing psoriasis.

The Simplified Psoriasis Index (SPI) is a summary measure of psoriasis with separate components for current severity (SPI-s), psychosocial impact (SPI-p), and past history and interventions (SPI-i). It derives from the Salford Psoriasis Index but replaces Psoriasis Area and Severity Index (PASI) with a composite weighted severity score designed to reflect the impact of psoriasis affecting functionally or psychosocially important body sites. Two complementary versions are available, differing only in that current severity (SPI-s) is either professionally (proSPI-s) or patient self-assessed (saSPI-s).

Nonhealing vegetating plaque on the finger: tuberculosis verrucosa cutis.

Tuberculosis verrucosa cutis is an uncommon form of tuberculosis that typically presents as a chronic warty plaque. It develops in individuals with moderate to high immunity to Mycobacterium tuberculosis due to inoculation of an open wound. We present the case of a Somali man born in the United Kingdom who presented with a nonhealing ulcer on the right hand of 10 years' duration.

Framework for improved communication: the Dermatology Lexicon Project.

A standardized dermatology vocabulary is central to our collective ability to gather clinical information consistently for patient care, to retrieve information for research or disease management, as well as to conduct outcomes analysis for quality improvement. The deficiencies of current classifications have been recognized by the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) in their decision to fund the development of a standard complete reference terminology for dermatology. The Dermatology Lexicon will have a major impact both on clinical care and on dermatologic research.