ESTIMATION OF THE CONDITIONAL PROBABILITY OF TUBERCULOSIS GIVEN THE RESPONSE OF A MANTOUX TEST

For the planning of community tuberculosis, prophylaxis one must know the prevalence of tuberculosis (TB) infection as a function of response to the Mantoux intradermal tuberculin test; the standard test for indicating Mycobacterium TB infection. The skin induration size used to select individuals for prophylaxis must be chosen carefully, in view of the costs associated with carrying out and supervising such prophylaxis. The Mantoux test was used to obtain measurements on adolescents in metropolitan Victoria and on a small sample of adolescents with clinical TB. These data are employed to obtain estimates and to construct upper confidence bounds for the conditional probability of TB infection, given the level of Mantoux response. Two conservative methods are presented; one is ‘nonparametric’, the other ‘semiparametric’. The analyses indicate that for responses up to and including 13 mm, the probability of TB infection is less than.07 with ninety-five percent confidence.     

The mixed economy, the neoliberal challenge, and the negotiated economy

In recent years the ideal of the mixed economy has been challenged by neoliberal theories. This article reviews the debate. A better definition of the concept is presented and used to clarify what is at stake in the debate.     

Response to Pennsylvania's Agricultural Preservation Programs1

Abstract Agriculture is the leading industry in the Commonwealth of Pennsylvania. At the same time, encroaching development has pressured prime agricultural land to change uses, a change usually considered irreversible. Some regions of Pennsylvania have used zoning to control and plan for the development of agricultural land, but these decisions have not always been agreed on. In response to conflicts over zoning and calls for more effective restrictions of development of prime agricultural soils, the state government implemented agricultural preservation programs designed to ensure the future viability of Pennsylvania's agriculture. While response has been reported as favorable, most reviews relied on voters' support of a state referendum to fund agricultural preservation programs. Few have examined local responses to the implementation of these programs. This paper explores local community responses to agricultural preservation and the state's programs in three regions of Pennsylvania which differ in levels of urban presence and pressure. Using secondary sources, qualitative data, and general population surveys, this analysis provides implications about strategies of agricultural preservation in a state which leads in such efforts.     

Explaining changes in married mothers’ employment over time

Employment of married mothers with preschool children rose dramatically between 1971 and 1990. Using CPS data, we find that about one-fifth of the increase in labor supply can be attributed to changes in mothers’ demographic characteristics (age, education, and number of children). Changes in the earnings opportunities of new mothers and their husbands explain another one-fifth of the growth in employment. Over the two decades, infants up to three months old became less of a barrier to employment, while women’s labor supply became more sensitive to their own earnings opportunities and less sensitive to those of their husbands.     

Piggybacking for business and nonprofits: a strategy for hard times

This article explains the conceptual foundations for the piggybacking strategy from the general strategic management, adoption of innovation, product life cycle, specialization and diversified portfolio strategy literatures. The strategic piggybacking strategy is compared and contrasted with the diversified portfolio and specialization strategies. Intention, dynamic investment flow, short vs long term, and mission similarities and differences are addressed. A case is made for considering strategic piggybacking as a synthesis of the specialization and diversified portfolio strategies. The conditions appropriate for adoption of a piggybacking strategy are also discussed.     

Using video observation in the family context: The association between camera-related behaviors and parental sensitivity

Research on parental sensitivity often relies on video observation of parent–infant dyads. However, to date, no study has assessed both infants’ and parents’ interactions with the camera, and how this relates to parental sensitivity levels. This exploratory study micro-coded camera-related behaviors (CRB) by 4-month olds and their mothers and fathers on a 1-s time base, and examined the associations between those behaviors and parental sensitivity in 75 Dutch families. While parents’ CRB made up only 0.8% of total interaction time, infants’ made up 12%. Multi-level time-series analyses showed that infants’ CRB predicted mothers’. Infants’ CRB predicted fathers’ CRB, and vice versa. Maternal sensitivity was significantly lower when children looked at the camera for over one-third of total interaction time (Cohen's d = 1.26). These findings indicate further research is required to better understand how video observation might threaten ecological validity.