Vijay N. Nair

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BACKGROUND Although the optimization of behavioral interventions offers the potential of both public health and research benefits, currently there is no widely agreed-upon principled procedure for accomplishing this. PURPOSE This article suggests a multiphase optimization strategy (MOST) for achieving the dual goals of program optimization and program(More)
BACKGROUND Initial trials of web-based smoking-cessation programs have generally been promising. The active components of these programs, however, are not well understood. This study aimed to (1) identify active psychosocial and communication components of a web-based smoking-cessation intervention and (2) examine the impact of increasing the tailoring(More)
The modeling and analysis of computer communications networks give rise to a variety of interesting statistical problems. This paper focuses on network tomography, a term used to characterize two classes of large-scale inverse problems. The first deals with passive tomography where aggregate data are collected at the individual router/node level and the(More)
Health behavior intervention studies have focused primarily on comparing new programs and existing programs via randomized controlled trials. However, numbers of possible components (factors) are increasing dramatically as a result of developments in science and technology (e.g., Web-based surveys). These changes dictate the need for alternative methods(More)
INTRODUCTION Research needs to systematically identify which components increase online intervention effectiveness (i.e., active ingredients). This study explores the effects of 4 potentially important design features in an Internet-based, population-level smoking intervention. METHODS Smokers (n = 1,865) were recruited from a large health care(More)
BACKGROUND Comparative risk perceptions may rival other types of information in terms of effects on health behavior decisions. PURPOSE We examined associations between comparative risk perceptions, affect, and behavior while controlling for absolute risk perceptions and actual risk. METHODS Women at an increased risk of breast cancer participated in a(More)
There is increased interest among network administrators and service providers to estimate quality of service parameters associated with their network operations. Two approaches are currently used for collecting and modeling network data: passive monitoring of link-level data or active probing to obtain path-level measurements. In this paper, we investigate(More)
BACKGROUND Young adulthood is a critical transition period for the development of health behaviors. We present here the results of a randomized controlled trial of an online avatar-hosted personal health makeover program designed for young adult smokers. METHODS We conducted a three-group randomized trial comparing delivery of general lifestyle content(More)