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PubMed1976

A factor analysis of body build in the rat.

Following a survey of the problems associated with the comparative study of measures of physique in domesticated and laboratory animals, techniques were developed for the measurement of body build in the adult albino laboratory rat (Rattus norvegicus). They involved anesthetisation of the animals and the use of calipers and a simple apparatus devised for the purpose. The 17 measures taken on 100 rats, 50 of each sex, are detailed and the reasons for excluding other given. Intercorrelations of all the measures and their reliability co-efficients, which were judged satisfactory, are presented. The tables of intercorrelations, one for each sex, were factor analysed separately, and rotations to simple structure performed. Two factors were identified, one having factor saturations on measures of body length and the other similarily defining body width. This pattern was similar for the two sexes and a single index of body build was therefore proposed in which the length of the rear foot is divided by the width of the shoulder girdle and multiplied by 100 to avoid decimals. The use of the index in other investigations is mentioned.

Animals↗
PubMed1976

The dimensionality of the human visual evoked scalp potential.

A small number of processes can account for most of the evoked potentials activity in the two subjects studied. Principal components analysis indicates that six independent processes can account for approximately 97% of the variability in the data. Moreover, the factor analysis and plots of the factor coefficients yield indications that the times during which these principal factors are active agree quite well with the times at which the equipotential maps show some organized activity. The question of dipoles being the underlying cause of the observed activity is not answered by the factor analysis. The principal factors are not unique, but models which have a small number of parameters are more justifiable in light of the results of this study.

Brain↗
PubMed1975

Factor analysis of attitudes toward abortion.

700 Ss rated the concept abortion on a series of bipolar adjectives. Factor analysis of the ratings suggested (a) that Ss judged the concept along four orthogonal dimensions, immoral-repelling, cruel-destructive, emotional-serious, and rational-impulsive and (b) that males and females had similar factor structures. Polarity analysis showed that abortion was seen as immoral, repelling, bad, cruel, destructive, ugly, sinful, emotional, serious, rational and impulsive. Although this is highly unfavorable compared to the results of previous research, it appears to represent a liberal trend.

Abortion, Induced↗
PubMed1976

Neonatal polycythemia in low birthweight infant.

74 low birthweight infants haematologic findings were studied during the first 24 hours and at the 8th day of life. By statistical methods derived from the multivariate analysis: stepwise multiple regression analysis and factor analysis, correlations were investigated between haemogram data (red cells count, haemoglobin and haematocrit levels and 18 others parameters. Most of the infants with polycythemia have toxaemic mothers and were born after a long gestation: they are affected by intra-uterine growth retardation, have a low glycaemia level but a normal calcaemia level, a large skull perimeter and a small thymus volume. But no correlation was observed between polycythemia and the following data: heart volume, neonatal icterus intensity, reticulocytes and erythroblasts counts.

Calcium↗
PubMed1979

Multifactorial probit analysis of mortality in burned patients.

Burn mortality statistics may be misleading unless they account properly for the many factors which may influence outcome. In reviewing such factors in our patients, we identified age, total burn area, third degree burn area, prior bronchopulmonary disease, abnormal Pao2, and airway edema as the factors present on admission which best distinguished survivors from nonsurvivors. Using multifactorial probit analysis, we then calculated the contribution of each to the probability of fatal outcome. The resultant six-factor model significantly improved estimation of the probability of fatal outcome when compared to probit analysis based only on the traditional factors of age and total burn area. It also revealed a spectrum of mortality probabilities varying with the additional factors present. Although crucial in comparing different approaches to burn care, consideration of such prognostic factors will not eliminate the need for randomized treatment trials, because other factors, some of which are obscure, may also influence mortality rates in burned patients.

Adult↗
PubMed1977

Research of international suicide.

Twenty two variables of social, economic, geographic and psychological significance, including suicide rate, were factor analysed for forty world nations. Five factors achieved eigenvalues of 1.00 or more, which were the Modern Technological State (France, Germany, Sweden), the Affluent State (the U.S.A.), the City-State (Israel, Singapore), the Horizontal Society (Chile, Guatamala), and the Developing Nation (Guyana, Costa Rica). A high national suicide rate was found to be significantly related to the Modern Technological State (P less than .001), and a low national suicide rate was found to be significantly associated with the Horizontal Nation (P less than .05). Results were interpreted in view of frustration theory and Durkheim's theory of suicide.

Cross-Cultural Comparison↗
PubMed1978

Behavioral correlates of age at first marijuana use.

Relationships between age at initial marijuana use and selected behavioral measures representing education, arrests, employment, alcohol use, and other drug use were examined for a sample of 370 male veterans. Younger age at marijuana use was found to be associated with less education, more arrests, and more other drug use prior to entering the service. A factor analysis of the correlates of age at initial marijiana use suggested three factors of delinquent activities: drug use, school delinquency, and other propensities for delinquency.

Adolescent↗
PubMed1975

[Study of the effect of certain factors on the process of tetracycline antibiotic crystallization].

Since such factors as temperature and time of the process had a significant effect on the residual activity of the mother solution during crystallization of tetracyclines, it was necessary to study the effect of the above factors on the process for determination of the crystallization optimal conditions. The experimental data provided creation of the regression equations and the curves for similar levels of the main parameters for tetracycline and oxytetracycline were calculated. The lowest values of the mother solution activity within the ranges tested were observed at the temperature of 2 degrees and the time of 3 hours.

Crystallization↗