The purpose of this study was to describe longitudinal changes in time domain spirogram indices and their variability. We therefore measured forced expiratory spirograms of 326 middle-aged male employees in two asbestos-using factories four times over 5 yrs. From the original sample of 326, 225 healthy subjects, who provided reliable results for three or more surveys, were selected for analysis...

Bioaerosol concentrations in office environments and their roles in causing building-related symptoms have drawn much attention in recent years. Most bioaerosol studies have been cross-sectional. We conducted a longitudinal study to examine the characteristics of airborne fungal populations and correlations with other environmental parameters in office environments. We investigated four office ...

Background: Multiple Sclerosis (MS) is one of the most important diseases due to its adverse clinical, social and economic consequences for affected people. This study tried to assess the quality of life of the patients suffering from Multiple Sclerosis in East Azerbaijan. Methods: This cross-sectional study used the Multiple Sclerosis Quality of Life-54 (MSQOL-54) questionnaire for interviewi...

BACKGROUND Little research has been done to examine whether smokers switch to illegal or roll-your-own (RYO) cigarettes in response to a change in their relative price. OBJECTIVE This paper explores how relative prices between three cigarette forms (manufactured legal, manufactured illegal and RYO cigarettes) are associated with the choice of one form over another after controlling for covari...

This paper aims to determine the impact of dividend policy on stock price volatility by taking firms listed on Tehran stock exchange.  A sample of 68 listed companies from Tehran stock exchange is examined for a period from 2001 to 2012.  The estimation is based on cross-sectional ordinary least square regression analysis to find the relationship between share price volatility and dividend poli...

We use a statistical model to estimate impulse responses of sectoral price indices to aggregate shocks and to sector-specific shocks. In the median sector, 100 percent of the long-run response of the sectoral price index to a sector-specific shock occurs in the month of the shock. The Calvo model and the sticky-information model match this finding only under extreme assumptions concerning the p...

Although it is important to consider multi-day activities in transportation planning, multi-day activity-travel data are expensive to acquire. In this study, we propose to generate multi-day activity-travel data through sampling from readily available single-day household travel survey data with considerations of day-to-day intrapersonal variability. One of the key observations we make is that ...