OBJECTIVES This study assessed the claim that children's television use interferes with time spent in more developmentally appropriate activities. METHODS Data came from the first wave of the Child Development Supplement, a nationally representative sample of children aged 0 to 12 in 1997 (N = 1712). Twenty-four-hour time-use diaries from 1 randomly chosen weekday and 1 randomly chosen weeken...

Objectives: The aim of the present study was to evaluate the relationship between the use of television and behavioral problems in children.  Methods: This is a descriptive and correlational research. The statistical population of the study included 4- to 6-year-old pre-school children in Tehran who were selected using multi-stage cluster sampling. A sample of 150 children was selected. T...

We measured utility curves for the hypothetical monetary costs as a function of time engaged in three everyday physical activities: walking, standing, and sitting. We found that activities requiring more physical exertion resulted in steeper discount curves, i.e., perceived cost as a function of time. We also examined the effects of gain vs. loss framing (whether the activity brought additional...

Background: Excessive utilization of electronic media may affect the individuals' health and quality of sleep. This study aimed to investigate sleep quality of the college students based on their diets and duration of time spent on the internet. Methods: In this cross-sectional web-based study, 385 students were selected randomly from the Qazvin University. Data was collected by a self-administ...

This paper investigates original issuers of high yield bonds in Chapter bankruptcy to determine which factors a ect the length of time spent in Chapter In order to do this analysis we propose a exible new duration model the censored partial regression model This model allows us to consider the e ect of some variable on the duration using a nonparametric functional form We nd that the choice of ...

the black bean aphid, aphis fabae scopoli, is a major pest of broad bean, vicia faba l. and sugar beet, beta vulgaris l., the most abundant parasitoid of a. fabae in agroecosystems is lysiphlebus fabarum (marshall), a multivoltine species with mainly thelytokous reproduction in central europe. since l. fabarum females mimic ants to obtain honeydew directly from aphids it was reasoned that a fem...