Effect size and power in assessing moderating effects of categorical variables using multiple regression: a 30-year review

The authors conducted a 30-year review (1969-1998) of the size of moderating effects of categorical variables as assessed using multiple regression. The median observed effect size (f(2)) is only .002, but 72% of the moderator tests reviewed had power of .80 or greater to detect a targeted effect conventionally defined as small. Results suggest the need to minimize the influence of artifacts that produce a downward bias in the observed effect size and put into question the use of conventional definitions of moderating effect sizes. As long as an effect has a meaningful impact, the authors advise researchers to conduct a power analysis and plan future research designs on the basis of smaller and more realistic targeted effect sizes.     

Individual differences in patterns of developmental opportunity and constraint during COVID-19: Implications for longitudinal well-being

Individual differences in sociodemographic characteristics and trait-like perceptions of opportunities and constraints may shape how people respond to adversities such as the COVID-19 pandemic. However, little is known about how these factors combine to form multifaceted profiles of developmental opportunity and constraint or the implications of such profiles for longitudinal well-being following major life stressors. Using 1-year data from a national sample of U.S. adults (n = 293), we identified profiles based on relevant sociodemographic characteristics (age, socioeconomic status, chronic conditions, functional status) and trait-like perceptions of opportunity and constraints (perceived mastery, perceived constraints). Results of latent profile analyses showed that three common profiles emerged at pandemic onset (veridical opportunity, perceived constraints, perceived opportunity). Subsequent latent growth models showed that, despite reporting more sociodemographic constraints, the perceived opportunity profile exhibited better 1-year emotional well-being (positive and negative affect) during the pandemic than the perceived constraints profile. Findings advance the literature by identifying multifaceted individual differences in profiles of developmental opportunity and constraint and by showing these profiles have consequences for longitudinal well-being following the pandemic onset.     

Effects of War-Induced Maternal Separation on Children's Adjustment During the Gulf War and Two Years Later1

Military personnel deployed to the Middle East included an unprecedented number of women, many of whom were mothers. Using a structural equation modeling approach, we examined the predictors of children's adjustment problems in data collected from a representative sample of 263 Air Force mothers 2 years after the Gulf War. Using a retrospective survey, we found that the main predictors of children's adjustment problems at the time of the war were mothers' difficulties in providing for the care of the children, mothers' deployment in the theater of the war (vs. deployment elsewhere), and degree of change in children's lives. Most important, war-related adjustment problems were not related to children's adjustment 2 years later, suggesting that the effects of maternal separation during the war were transient.     

Telephone Counseling for Smoking Cessation: What's in a Call?

Telephone counseling for smoking cessation has been gaining popularity as studies have demonstrated its efficacy. What comprises a successful program, however, has not yet been detailed in the literature. In this article, an innovative telephone counseling intervention for smoking cessation is described, with attention to the clinical issues of client assessment, motivation, self-efficacy, planning, coping, relapse-sensitive call scheduling, and self-image. Counselor training and supervision issues, ethical and legal considerations regarding this form of service delivery, and suggestions for future direction also are outlined.     

General and specific support expectations and stress as predictors of perceived supportiveness: an experimental study.

Fifty-four undergraduates and their mothers participated in an experiment to evaluate hypotheses derived from a theory of perceived social support (Pierce, Sarason, & Sarason, 1990). Regression analyses indicated that the variables in the model accounted for 14.83% and 40.93%, respectively, of the variance in students' perceptions of their mothers' behavior assessed during 2 standardized laboratory situations. Unique effects were found for students' expectations for support from and conflict with their mothers in both pre- and posttask situations, although the effect of conflict was contrary to prediction in the pretask situation. Stress had an impact only in the posttask situation. Students' general expectations for support had no unique impact in either situation. Implications for the role of general and specific expectations for support and conflict, and situational factors, in theories of perceived social support are discussed.