体重比率增加的男性易发生不育

旧金山国立交通安全物理数据分析员展开的一项数据分析辨认出，与正常人BMI的成人相比，BMI股票价格减少的成人子代可能性更大。

Markku Sallmen就职于芬兰职业健康数据分析员。他话说：“数据显示，成人BMI每减少20磅（约9公斤），子代的可能性将减少10%。”BMI股票价格是由人的BMI和身高计算得来的数据，对大多数人，BMI股票价格可成为身体老年人的可靠加权，也常被用来筛查BMI太重。

数据分析者对工商业健康数据分析原计划中申请的夫妇展开了数据分析。这项始于1993年的原计划目标是为了扫描影响工商业社区佃农及其家人身体健康的主因。

国立交通安全物理数据分析员的流行病学家Donna BairdClark话说：“与BMI正常人的妇女儿童相比，太重或老年人的妇女儿童较难男婴，但是比如说具体情况的成人是否普遍存在生育问题尚未有人数据分析。”这项结果刊登在2006年9年底《流行病学杂志》上。

子代和BMI股票价格的资料叫做1468位佃农和他们的前夫在登记确立这项数据分析时完成的问卷调查。后者完成家人身体健康调查表，都有夫妇的生育史，前者报告家人BMI和身高的调查表。数据分析分析之外登记申请4年前打算生育及女方岁数低于40的夫妇。

数据分析者将这些夫妇分为子代组成员和可育组成员，超过1年未受孕者归为子代组成员，在1年内受孕者归为可孕组成员。大多数成人和女性岁数超过30岁，28%的夫妇有子代症状。

数据分析者辨认出成人的BMI股票价格是子代症的法理可怕主因。副教授调整了其它影响生育力的主因，如女性的高BMI股票价格、岁数、吸烟、抽烟、暴露于杀虫剂，调整再次，随着BMI股票价格的减少，子代呈线性减少，在老年人成人，子代率减少1倍。数据分析者还辨认出无论岁数大小，成人的BMI股票价格都是子代症的可怕主因。

虽然没有频率的数据，但据推测太重的成人较BMI正常人的成人次数寡，从而影响了生育。然而，关于卵子特点的数据分析辨认出太重和老年人的成人，卵子质量较低，激素不平衡。

国立交通安全物理数据分析员的主任Did A. SchwartzClark话说：“这项数据分析提出批评了某些与老年人有关的另外的身体健康问题，抑制老年人可倡导成人患病，其中就都有他们的生殖身体健康。”该数据分析员还提出批评了一项取而代之战略性的原计划——“环境物理和进化身体健康的新最前沿”，这项原计划将于一年底5年底实施，目标在于利用交通安全物理倡导公众理解疾病的中风原因并倡导进化身体健康。

Men with increased body mass index (BMI) were significantly more likely to be infertile than normal-weight men, according to research conducted at the National Institute of Environmental Health Sciences (NIEHS), one of the National Institutes of Health."The data suggest that a 20-pound increase in men's weight may increase the chance of infertility by about 10 percent," says Markku Sallmen, lead author on the paper who is now at the Finnish Institute of Occupational Health. BMI is a number calculated from a person's weight and height. BMI provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.The researchers studied couples enrolled in the Agricultural Health Study (AHS), a large project that began in 1993 examining factors that impact the health of farmers and their families in agricultural communities. "Women who are overweight or obese tend to he a more difficult time becoming pregnant than normal-weight women, but whether men who are overweight or obese also he fertility problems had not been studied," says Donna Baird, Ph.D., an NIEHS epidemiologist with the study. The study is published in the September 2006 issue of Epidemiology.The data on infertility and body mass came from questionnaires that 1,468 farmers and their wives completed when they enrolled in the study. The wives completed a family health questionnaire, which included information about the couple's reproductive history. The men reported their weight and height on a questionnaire about their health. The ysis was limited to couples with a pregnancy attempt during the four years before enrollment, and to women under the age of 40. The researchers divided the couples into infertile and fertile groups. The infertile couples were those that tried for longer than a year to conceive, and the fertile couples were those that conceived within a year. The majority of men and women were more than 30 years old. Twenty-eight percent of the couples had experienced infertility.Researchers found that men's BMI was an independent risk factor for infertility. The researchers adjusted for other factors that could affect fertility, including high BMI of the woman, age, cigarette smoking, alcohol intake, and solvent and pesticide exposure. After adjustment, there was a general increase in infertility with increased BMI, reaching a nearly 2-fold increase among obese men. When researchers divided the sample into two equal groups by men's age, they found that men's BMI was a risk factor for infertility in both the older and younger men.The researchers did not he data on frequency of sexual intercourse, so it is possible that overweight men he less sexual intercourse than their normal weight counterparts and this could influence fertility. However, there he been recent studies looking at semen characteristics that show lower semen quality for overweight and obese men, as well as hormonal differences."This study provides data on some additional health problems associated with obesity," said Did A. Schwartz, M.D., director of the National Institute of Environmental Health Sciences. "Preventing obesity can help improve men's overall health, perhaps even their reproductive health."The NIEHS unveiled a new strategic plan, "New Frontiers in Environmental Sciences and Human Health," in May aimed at challenging and energizing the scientific community to use environmental health sciences to understand the causes of disease and to improve human health.叫做

编辑：蓝色幻想

编辑： 张靖