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Study Shows Teen Contraception Use Declining, Level Of Sexual Activity Unchanged
After years of declining teenage pregnancy rates and improved teen contraception use during the 1990s and early 2000s, the trends appeared to have flattened or even reversed among some groups of teens in recent years, according to a study from Columbia University"s Mailman School of Public Health and the Guttmacher Institute, the Christian Science Monitor reports. Researchers found that from 2003 to 2007, teens" contraceptive use declined by 10%, while their level of sexual activity did not change. The decrease in contraceptive use was particularly prevalent among black teens. The figures take into account the rate of contraception use as well as the types of contraceptives used, as methods vary in effectiveness. Teen condom use leveled off and in some cases declined, according to the study. The study also reported that the teen birth rate increased by 5% from 2005 to 2007. According to the study"s authors, the findings suggest a link between declining teen contraception use and the rise in abstinence-only education during former President George W. Bush"s administration. President Obama"s fiscal year 2010 budget proposal calls for redirecting some abstinence-only funds toward increased comprehensive sex education, the Monitor reports. In addition to the effects of abstinence-only sex education, the decline in condom use also could be tied to lessening concern about sexually transmitted infections, including HIV/AIDS. A shift in the teen population to include a higher number of Hispanics -- who have the highest rates of teen pregnancy and birth -- also could contribute to the findings. Laura Lindberg, one of the study"s authors and a senior research associate at Guttmacher, said, "In the end, this story is really about the loss of momentum." She added that although the statistical changes are small, "they raise concern about what the next few years will bring in this country." Sarah Brown, director of the National Campaign To Prevent Teen and Unplanned Pregnancy, noted that the proportion of births to unmarried women, particularly among women ages 20 to 24, also is on the upswing (Feldmann, Christian Science Monitor, 6/18).

Quantification Of Perfusion & Permeability In Prostate Using Dynamic Contrast-Enhanced MRI With Inversion-Prepared Dual-Contrast Sequence
UroToday.com - The dynamic contrast-enhanced dynamic susceptibility contrast magnetic resonance imaging (DCE-DSC-MRI) technique presented in the article(1) is based on a novel dual-contrast sequence. The sequence is a gradient echo sequence that uses a single inversion pulse and subsequent acquisition of two contrasts/echoes with different inversion and echo times. Inversion preparation increases the signal-to-noise ratio in comparison to other gradient echo sequences. The blood volume in the prostate is relatively small, i.e., approximately one percent, while the interstitial contrast-agent-enhancing volume is approximately 20 percent. Therefore, conventional imaging sequences fail to separate the low contrast agent signal originating from the blood from that originating from interstitial tissue. The first contrast/echo is acquired with a short echo time and is T1-weighted, allowing quantification of the total signal contribution while failing to separate the blood signal from the interstitial contrast agent signal.
News of the day
Research Points To A New Way To Protect Kidneys Threatened By Insufficient Blood Or Toxins
Better treatments for acute renal failure may be possible by blocking the mitochondrial fragmentation that occurs when kidneys don"t get enough blood or are exposed to toxins, researchers at the Medical College of Georgia report in the may issue of The Journal of Clinical Investigation.
Diagnostics

Cigarette Packaging Still Misleading Consumers Over Health Hazards

New research suggests that current regulations have failed to remove misleading information from cigarette packaging, revealing that a substantial majority of consumers believe cigarettes are less hazardous when the packs display words such as "silver" or "smooth," lower numbers incorporated into the brand name, lighter colours or pictures of filters. In a study of 603 adults published today (Tuesday) in the online edition of the Journal of Public Health, Canadian researchers call for the list of words banned from cigarette packaging to be expanded beyond the current prohibition of "light," "mild" and "low-tar" and suggest that other pack design elements may need to be eliminated to prevent consumers erroneously believing that one brand is less harmful than another. "Research has already shown that using words such as "light," "mild" and "low tar" on cigarette packaging misleads consumers into thinking that one brand carries a lower health risk than another and that"s why those words have been outlawed in more than 50 countries, but there has been virtually no independent research on these other packaging tactics to support broader regulation," said the study"s leader, David Hammond, a professor of health studies at the University of Waterloo in Ontario, Canada. "Our study found that commonly-used words not covered by the bans, as well as other packaging design elements such as colour, the use of numbers and references to filters, were just as misleading, which means there"s a loophole that needs to be closed." Tobacco use is the leading cause of preventable death worldwide. The World Health Organization estimates that it kills more than 5 million people a year. Smoking is linked to an increasing number of diseases, including heart disease and stroke, respiratory diseases and 10 different forms of cancer. Globally, use of tobacco products is increasing. Smokers who perceive greater risks are more likely to try to quit and to remain abstinent. The researchers studied the perceptions of 312 smokers and 291 non-smokers recruited in a shopping mall in Ontario, Canada, using nine pairs of fictitious cigarette packet replicas incorporating words and design elements commonly used by leading international brands. Each pair differed in only a single design aspect - either a word such as "silver" versus "full-flavour" or "smooth" versus "regular" or "mild" versus "regular" or "light" versus "ultra-light"; a number incorporated into the brand name, such as 6 versus 10; a colour such as light blue versus darker blue or white versus grey and the presence of an illustration of a filter with the words "charcoal filter" written above it. All the packets included standard health warnings and could be picked up and handled by the study participants. The researchers asked each participant to rate which of the two from each pair they believed would taste smoother, which would deliver more tar and which they would choose if they were trying to reduce the risks to their health. The respondents were given the option of saying "no difference." A total of 80% said they believed the package labelled "smooth" would be less hazardous than the one labelled "regular." Similarly, 73% judged the brand labelled "silver" as less hazardous than the one labelled "full-flavour" and 84% thought the pack with "6" in the brand name carried less health risk than the one with "10" in it. Also, 79% said the lighter blue pack would have a lower health risk than the darker blue one and 76% said the one depicting a charcoal filter would not be as bad for their health as the one without such an illustration. Similar results were found for the words "mild," "light" and "ultra-light," consistent with previous research. The misconceptions were more marked in smokers, and more prevalent among smokers of so-called "light" or "mild" brands than among other smokers. "An important function of tobacco marketing has been to reassure consumers about the product"s risks and a central feature of the strategy has been to promote the perception that some cigarettes are less hazardous than others, so that health-concerned smokers are encouraged to switch brands rather than quit," Hammond said. "We"ve seen research described in internal tobacco industry documents indicating that reference to filters and the use of lighter colours conveys that message successfully, but now we have independent confirmation, plus evidence on other words in widespread use." "The truth is that all cigarettes are equally hazardous, regardless of the filter type, what colour the pack is or what words appear on it," Hammond said. "These tactics are giving consumers a false sense of reassurance that simply does not exist." Hammond said that because the tobacco industry uses similar packaging practices in other countries, he would expect findings to be similar elsewhere. In fact, he said, levels of false beliefs can be expected to be even higher in many other countries, where smokers are exposed to fewer s of anti-tobacco information than they are in Canada. The findings lend support to the idea of plain or "standardized" packaging for tobacco products, Hammond added. Standardized packaging would involve removing any brand imagery so that all packs look the same except for the brand name, which would be in a mandated size, font and position. Guidelines provided under the World Health Organization"s Framework Convention on Tobacco Control, the world"s first global public health treaty, state that countries should consider plain packaging. Such regulations are being considered in several countries, including the UK and Australia, but have yet to be adopted. "My guess is that standardized packaging regulations will follow a similar course as pictorial health warnings: One country will establish an international precedent and many others will follow soon after. People will look back at the day when we sold lethal products in attractive packaging as unacceptable," he said. [1] The impact of cigarette package design on perceptions of risk. Journal of Public Health. doi:10.1093/pubmed/fdp066 Emma Ross Oxford University Press


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