Diagnostic criteria of traumatic central cord syndrome. Part 1: A systematic review of clinical descriptors and scores

STUDY DESIGN: Systematic review. BACKGROUND: The applied definition of traumatic central cord syndrome (TCCS) lacks specific quantified diagnostic criteria. OBJECTIVE: To review currently applied TCCS diagnostic criteria and quantitative data regarding the 'disproportionate weakness' between the upper and lower extremities described in original studies reporting on TCCS subjects. METHODS: A MEDLINE (1966 to 2008) literature search was conducted. The descriptors applied to define TCCS were extracted from all included articles. We included original studies that reported on the differences in motor score (based on the Medical Research Council scale) between the total upper extremity motor score (UEMS) and the total lower extremity motor score (LEMS), in a minimum of five TCCS patients at the time of hospital admission. The mean difference between the total UEMS and the total LEMS of the patients included in each study was calculated. Case reports were excluded. RESULTS: None of the identified studies on TCCS patients reported inclusion and/or exclusion criteria using a quantified difference between the UEMS and LEMS. Out of 30 retrieved studies, we identified seven different clinical descriptors that have been applied as TCCS diagnostic criteria. Nine studies reporting on a total of 312 TCCS patients were eligible for analysis. The mean total UEMS was 10.5 motor points lower than the mean total LEMS. CONCLUSIONS: There is no consensus on the diagnostic criteria for TCCS. Nevertheless, this review revealed an average of 10 motor points between the UEMS and LEMS as a possible TCCS diagnostic criterion. However, further discussion by an expert panel will be required to establish definitive diagnostic criteria

A guide to the computation of stationarity tests

Stationarity test, KPSS test, LMC test, Optimal bandwidth selection, Long-run variance estimation, Purchasing Power Parity,

What Fosters Individual-Level Absorptive Capacity in MNCs? : An Extended Motivation-Ability-Opportunity Framework

Absorptive capacity has been marked as one of the most important capabilities of Multinational Corporations for effective management of knowledge. To address calls for research on micro-level origins of the concept, this paper focuses on the determinants of individual-level absorptive capacity. We examine the extent to which individuals' capability to recognize, assimilate and exploit new knowledge from the environment is shaped by different forms of work motivation (i.e., intrinsic and extrinsic), overall ability, exposure to diverse country contexts and personal characteristics. Drawing on and extending the Motivation-Ability-Opportunity framework, we develop and test a set of hypotheses. Using a unique dataset collected from 648 individuals in a multinational corporation, we show that individuals' intrinsic motivation and overall ability are the key antecedents of absorptive capacity. In contrast, extrinsic motivation does not emerge as a significant predictor. We find that past international assignments to distant countries could be detrimental to individuals' absorptive capacity. However, our results suggest that for those individuals who are open to new experiences, assignments to distant countries become useful opportunity for absorptive capacity development. These findings contribute to existing literature by showing effects of alternative types of motivation and underscoring the importance of using selective assignment when considering exposure to diverse country context as a tool for employee capability development