The Swedish version of the STarT MSK Tool: cross-cultural adaption, test-retest reliability, and aspects of validity.

Background: Musculoskeletal disorders (MSDs) are a common reason for seeking primary health care. The STarT Musculoskeletal (MSK) tool is designed to stratify patients suffering from MSDs to risk groups, based on prognostic factors.

Aim: The aim was to translate and cross-culturally adapt the STarT MSK tool in a Swedish primary health care context through testing of reliability and construct validity.

The Swedish version of the Lumbar Spine Instability Questionnaire: A clinimetric study of validity and reliability.

Introduction: The Lumbar Spine Instability Questionnaire (LSIQ) is a patient-reported outcome measure (PROM) suggested to measure clinical instability of the spine.

Objective: The aim was to translate and cross-culturally adapt the LSIQ into Swedish and to test its measurement properties.

Methods: We included people with low back pain (LBP) seeking primary care (n = 101).

Maximum-Entropy Tools for Economic Fitness and Complexity.

The concepts of economic fitness and complexity, based on iterative and interdependent definitions of the quality of exporting countries and exported products, have led to novel insights into the dynamics of production and trade. A key step in the calculation of these quantities is the preliminary identification of statistically relevant country-product pairs.In this paper, we propose a method that could improve the current practice of filtering based on the revealed comparative advantage, by employing the maximum-entropy principle to construct an unbiased link weight probability distribution that, unlike the traditional thresholding method, allows for the statistical assessment of empirical trade volumes.

Cell-based therapies for osteonecrosis of the femoral head.

Osteonecrosis of the femoral head is a disabling condition and a known complication of hematopoietic cell transplants (HCT). It is characterized by empty lacunae in the osseous matrix and necrotic marrow elements. The most important risk factor in HCT recipients is steroid exposure, frequently in the context of graft-versus-host disease.

Construction and interpretation of equal-tempered scales using frequency ratios, maximally even sets, and P-cycles.

Using recent developments in music theory, which are generalizations of the well-known properties of the familiar 12-tone, equal-tempered musical scale, an approach is described for constructing equal-tempered musical scales (with "diatonic" scales and the associated chord structure) based on good-fitting intervals and a generalization of the modulation properties of the circle of fifths. An analysis of the usual 12-tone equal-tempered system is provided as a vehicle to introduce the mathematical details of these recent music-theoretic developments and to articulate the approach for constructing musical scales. The formalism is extended to describe equal-tempered musical scales with nonoctave closure.