Measurements of cosmic-ray low-energy antiproton and proton spectra in a transient period of solar field reversal.

The energy spectra of cosmic-ray low-energy antiprotons ( *p's) and protons ( p's) have been measured by BESS in 1999 and 2000, during a period covering reversal at the solar magnetic field. Based on these measurements, a sudden increase of the *p/p flux ratio following the solar magnetic field reversal was observed, and it generally agrees with a drift model of the solar modulation.

Precision measurement of cosmic-Ray antiproton spectrum

The energy spectrum of cosmic-ray antiprotons ( &pmacr;'s) has been measured in the range 0.18-3.56 GeV, based on 458 &pmacr;'s collected by BESS in a recent solar-minimum period. We have detected for the first time a characteristic peak at 2 GeV of &pmacr;'s originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS data with still higher statistics will allow us to study the solar modulation and the propagation in detail and to search for primary &pmacr; components.

A polydiagnostic study of depressive disorders according to DSM-IV and 23 classical diagnostic systems.

The classification of mood disorders is one of the most highly debated topics in modern psychiatry. The introduction of DSM-III (and its followers) has set a new standard in this controversy but little empirical evidence is available as to how the various classical diagnostic categories of mood disorders by Kraepelin, Schneider, Leonhard, Hamilton, Kielholz, Winokur and others compare with this new standard. The Intensive Prospective Study arm of the Group for Longitudinal Affective Disorders Study has studied a broad spectrum of mood disorders in 23 participating centres from all over Japan with a polydiagnostic semistructured interview called Comprehensive Assessment List of Affective disorders. In this paper we examined how the various classical diagnostic systems of depressive disorders correspond to the DSM-IV diagnoses, and found the following: (1) The classical 'neurotic' or 'psychogenic' depressions are diagnosed as major depression and not as dysthymia in DSM-IV; although dysthymia was dubbed as 'depressive neurosis' in DSM-III, its criteria were not true to the traditional usage of the term. Viewed from the other side of the coin, DSM-IV can be said to stand in the unitary tradition. (2) Some of the classical diagnostic categories such as Schneider's depressive psychopathy and Klein's acute dysphoria as well as modern ones such as Akiskal's subaffective dysthymia and Angst's recurrent brief depression were rarely seen in traditional psychiatric treatment settings. (3) Comparisons of the unique diagnostic systems such as those by Leonhard, Winokur and Berner warrant further studies on their validity.

Screening for depression among first-visit psychiatric patients: comparison of different scoring methods for the Center for Epidemiologic Studies Depression Scale using receiver operating characteristic analyses.

The present paper aims to compare the ability of eight scoring methods for the Center for Epidemiologic Studies Depression Scale (CES-D), one of the most widely used self-report inventories for depression, to screen for a major depressive episode. The subjects were 591 patients who constituted representative samples of the first-visit patients to 23 psychiatric hospitals and clinics all over Japan. The criterion diagnoses were given by a semi-structured interview with established inter-rater reliability. The eight alternative scoring methods included the conventional Likert method, which gives the weights 0, 1, 2 and 3 to the four anchor points of the CES-D; the presence method, which gives the weights 0, 1, 1 and 1, respectively; the GHQ method, which gives the weights 0, 0, 1 and 1, respectively; the persistence method, which gives the weights 0, 0, 0 and 1, respectively; 10-item version, 5-item version, single-item version and the algorithmic method. On the basis of the receiver operating characteristic (ROC) analyses, it was found that the traditional Likert scoring method of the full CES-D performed best in detecting major depressive episodes among first-visit psychiatric patients. The presence method, the GHQ method and the 10-item version appeared to have a similar ability. The persistence method, the 5-item version and the single-item version resulted in significantly worse performance.