Zinc status and cognitive function of pregnant women in Southern Ethiopia.

The relation between zinc status and cognitive function was examined in a cross-sectional study in the Sidama area of Southern Ethiopia. Pregnant women >24 weeks of gestation from three adjacent rural villages volunteered to participate. Mean (s.d.) plasma zinc of 99 women was 6.97 (1.07) mumol/l (below the cutoff of 7.6 mumol/l indicative of zinc deficiency at this stage of gestation). The Raven's Coloured Progressive Matrices (CPM) test was administered individually. Scores for the Raven's scale A, which is the simplest scale, ranged from 4 to 10 of a possible 12. Women with plasma zinc <7.6 mumol/l had significantly lower Raven's CPM scale A scores than women with plasma zinc concentrations >7.6 mumol/l. Plasma zinc and maternal age and education predicted 17% of the variation in Raven's CPM scale A scores. We conclude that zinc deficiency is a major factor affecting cognition in these pregnant women.

Children of adolescent mothers: attachment representation, maternal depression, and later behavior problems.

Underlying the responses of 34 44-month-old children of adolescent mothers to five attachment narratives were two factors--departure and reunion. The departure factor included disorganized and insecure responses to parents' departure as well as disorganized responses to narratives about children's misbehavior and fear. Scores predicted children's externalizing behavior problems 10 months later and discriminated children in the clinical from those in the normal range for externalizing problems. Maternal depression explained significant additional variance in children's externalizing problems.

The relationship of moral reasoning and AIDS knowledge to risky sexual behavior.

Two hypotheses were tested in this study: (a) moral reasoning and risky sexual behaviors are inversely correlated; (b) the relationship between AIDS knowledge and sexual behavior is mediated by moral reasoning such that AIDS knowledge and risky sexual behaviors are inversely correlated for higher-level moral reasoners but not for lower-level reasoners. Subjects were 103 undergraduate students who completed an instrument assessing moral reasoning, the Defining Issues Test, and two questionnaires assessing sexual behavior and knowledge about AIDS. Factor analysis identified five sexual risk-taking factors with alphas of .60 or higher. Results supported both hypotheses: (a) Risk taking during sexual intercourse (i.e., lower likelihood of using condoms) and risk taking during anal sex were significantly inversely correlated with moral reasoning; (b) For high moral reasoners, two measures of sexual risk taking were significantly negatively correlated with knowledge about AIDS: as knowledge increased, risk taking during sexual intercourse and engagement in a variety of sexual experiences decreased. The reverse relationship was true for low moral reasoners. Implications for moral development theory and research as well as for AIDS prevention campaigns are discussed.

Infant day-care, attachment, and the "file drawer problem".

The research literature on infant day-care and attachment may be biased by the unavailability of "file drawer" studies, unpublished data showing no statistically significant effects. Replication studies, whether showing an effect or not, are essential to clarify the relation between day-care and attachment. This study of 105 12-month-olds is an attempt to replicate four similar studies summarized and combined by Belsky to show that infants in day-care are at risk for insecure attachment. In the present study, no results were robust enough to emerge consistently, although there was a trend for more negative attachment outcomes to be associated with little or part-time day-care rather than with full-time day-care. In general, the results suggest that the specific measures, definitions of full- and part-time, and statistical techniques used in studies examining the relation between day-care and attachment are likely to affect the outcome of such studies.

The mediating effects of self-esteem and coronary-prone behavior on problem solving and affect under low and high stress.

Self-esteem and coronary-prone behavior were identified as two personality constructs related to different stress responses. It was hypothesized that in the case of low self-esteem Type A subjects the conflicting stress responses would have a particularly adverse effect on problem-solving behavior, mood, and self-perception. Subjects were 32 Type A and 32 Type B males evenly divided into high and low self-esteem groups. Half of the subjects in each group solved 10 matrix problems under high stress, half under low stress. Compared with high self-esteem Type As, low self-esteem Type As under high stress became more hostile and perceived themselves as more tense and more hurried. They also tended to make more errors. Results are interpreted as implying that low and high self-esteem Type A subjects are not psychologically homogeneous. It is suggested that the two groups may differ substantially in terms of cardiovascular risk.

The development of functionally similar and dissimilar operations of exclusion.

Of Piaget's 16 operations of binary propositional logic, 5 concern exclusion. These 5 were classified into 2 operations of varying the independent variable, 2 of holding the independent variable constant, and tautology. The use of these 3 sets of operations and of levels of thought (concrete through formal) was assessed in 33 fifth graders, 27 sixth graders, and 31 seventh graders. Subjects' levels of thought were significantly affected by their grade. However, their use of the operations of exclusion was not. Instead, as predicted, formal operational and transitional subjects differed in their use of dissimilar operations. A proportionally greater number of formal operational subjects used the operation of varying the independent variable, whereas a proportionally greater number of transitional subjects used the operation of holding the independent variable constant.