Variations in Natural Fertility: The Effect of Lactation and Other Determinants

The analysis focuses on average waiting times to a fertile conception, as derived from non-contraceptive exposure in second and higher-order birth intervals. Life-table estimates are derived from exposure in the two-year periods preceding the survey, for 20 surveys in Africa, Asia and Latin America undertaken as part of the WFS programme. Differences in the waiting time to conception are examined as a function of the duration of lactation and post partum abstinence. In addition, the extent to which variations in waiting times are produced by country and regional effects, and effects due to age, duration of marriage and parity are examined. The analysis points out the dangers of deriving estimates of natural fertility from the sub-group of women who never breastfed.     

Tools for screening for interpersonal violence: state of the science

In recent decades, the prevalence of abuse against women, older persons, and persons with disabilities has become a major public health problem. Health professionals, urged by their professional associations to universally screen these groups, have employed various tools in an effort to identify individuals in need of help. Yet many of the tools used widely in clinical settings have limitations in terms of empirical soundness. This article presents tools used to screen women, older persons, and persons with disabilities as well as data on the reliability and validity of these instruments. These properties and the resources needed to reduce harm are important factors to consider before implementing screening. The article concludes with a summary of the risk-benefit issues related to the use of these tools and universal screening in general.     

How Tautological Are Interspecies Correlations of Carcinogenic Potencies?

Crouch and Wilson demonstrated a strong correlation between carcinogenic potencies in rats and mice, supporting the extrapolation from mouse to man. Bernstein et al. , however, show that the observed correlation is mainly a statistical artifact of bioassay design. Crouch et al. have a comeback. This paper will review the arguments and present some new data. The correlation is largely (but not totally) tautological, confirming results in Bernstein et al.     

Union administrative practices: A comparative analysis

In response to growing challenges, many labor organizations are reevaluating themselves in an effort to become more efficient and effective. Their efforts, however, are limited by their frames of reference. Seldom do unions compare practices across labor movements. To expand these frames of reference we compare union administrative practices in three countries: Canada, the United Kingdom, and the United States. Two specific areas of union administration are examined — human resource/personnel practices and strategic planning. Results from these countries are presented and analyzed to identify and explain similarities and differences.     

The Unique Aspects of Short-Term Teaching: How to Teach the “How To's” to the Doers

Effective short-term teaching, as in continuing education, requires of the teacher special competence in small group dynamics and current practice involvement. Students are practitioners who are motivated to learn quickly whatever will be immediately useful to them on their jobs. Objectives must be clearly defined and understood by both teacher and learner and content presented in a specific and well-focused manner. Educators involved in short-term teaching should relate participants' experiences to concepts, facilitate sharing, and involve participants in developing content. Teaching methodology is purposefully selected to stimulate learner engagement. Evaluation of progress toward educational goals is an ongoing process.