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conclusions the results showed that the effect of several psychosocial, behavioral, and demographic risk factors on adolescents' smoking status. thus, design and implementation of interventions based on the results of the present study may be effective in preventing tobacco smoking among adolescents. patients and methods this cross-sectional study was performed on 810 male adolescents recruited...

Background Infertility is the inability to conceive children after one year of unprotected intercourse. The estimated prevalence of infertility in Canada is 11.5-15.7%. Fertility problems affect approximately one in seven couples in the United Kingdom (UK). Infertility occurs in conditions in which the pregnancies end with recurrent miscarriages (ASR) or birth of a child with multiple congenita...

OBJECTIVE To estimate the prevalence of, and identify factors associated with, accumulated risky behavior relating to cardiovascular diseases among adults. METHODS This was a population-based cross-sectional study on a representative sample of 2732 adults of both sexes in Pelotas, Southern Brazil, in 2010. The behavioral risk factors investigated were: smoking; leisure-time physical inactivit...

The eeect of incomplete information on the term structure of interest rates is examined in the framework of a pure exchange economy under uncertainty. When the growth rate of the aggregate endowment is known, the term structure is at and deterministic. When agents do not observe the (constant) growth rate, interest rates are stochas-tic and the term structure turns out to be linearly decreasing...