BACKGROUND Although there is a growing interest in the epidemiology of sedentary behaviours, it is unknown whether sedentary behaviour questionnaires are broad markers of sedentary time. The aims of this study were to determine the: (i) reliability of the Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) screen time-based sedentary behaviour questionnaire; and (ii) its validity, ...

objective MRI is increasingly used in Rheumatoid arthritis (RA) research. A EULAR task-force recently suggested that MRI can improve the certainty of the diagnosis RA. Since this recommendation may reflect a tendency to use MRI in daily practice, thorough studies on the value of MRI are required. Thus far no large studies have evaluated the accuracy of MRI to differentiate early RA from other e...

Methods An observational cross-sectional study was carried out to compare patients’ satisfaction after 4-6 months (group A) or 9-12 months (group B) of SLIT treatment by the use of a validated Spanish satisfaction questionnaire (ESPIA) consisting of 16 items on a 5-point Likert scale (scale 16-80, higher score indicating more satisfaction). Secondary objectives were to investigate relation betw...

This mixed-methods study examined barriers to and facilitators of street children's drug use cessation in Eldoret, Kenya utilizing a cross-sectional survey and focus group discussions with a community-based sample of street-involved children and youth. The primary objective of this study was to describe factors that may assist or impede cessation of drug use that can be utilized in developing s...

This study aimed at evaluating the validity of cone-beam computed tomography (CBCT) for assessing mandibular bone quality using the Klemetti classification. The morphology of the endosteal mandibular cortex of 30 (60 hemi-mandibles) postmenopausal women between the ages of 45 and 80 years was evaluated based on the Klemetti classification in panoramic radiographs used as reference images. After...

classification of occlusion is the first step in diagnosing the relationship between the upper and lower jaw's teeth. based on angle's classification, occlusion is divided into three categories: class i, class ii, and class iii. the aim of this study was to determine the prevalence of occlusion categories, based on angle's classification, in adolescents with permanent dentition in tehran. this ...

Methods: A descriptive and quantitative retrospective cross-sectional study was made of the main causes for amputations performed in the period from January 1998 to January 2008 in Hospital de Base, São José do Rio Preto in under 15-yearold individuals. Data, including the age of the patient, gender, rehospitalizations or further procedures and the reason for surgery were obtained from hospital...

Objective: To determine the prevalence of smoking among dentists in the Federal District of Brasília, Brazil. Methods: A descriptive, cross-sectional survey, involving 446 dentists residing in the Federal District, was conducted in the second semester of 2004. Data regarding the smoking habit were obtained using a World Health Organization questionnaire that was translated and validated for use...

Cross sectional estimation of convergence regressions is known to be hazardous if there is convergence towards heterogeneous steady state values. In this paper, Monte Carlo methods are used to investigate the implications of this parameter heterogeneity problem. The cross sectional and pooled OLS estimators are compared with a panel estimator which is unaffected by heterogeneity. If there is he...