确有其事？左撇子增加偏头痛风险
Really?The Claim: Being Left-Handed Adds to the Risk of Migraines
By ANAHAD O’CONNOR
Published: April 15, 2008
THE FACTS As if left-handers did not have it hard enough.
声明：左撇子增加患偏头痛的风险！
这是真的吗？
作者：ANAHAD O’CONNOR
发表时间：2008.4.15
事实好象是左撇子并未面临困境
Already burdened with the minor mishaps that arise from living in a world designed for righties, their lot in life seemed to worsen considerably in the 1980s, when a study argued that southpaws had several times the risk of chronic headaches — and immune disorders — as their right-handed counterparts. The reason, it was theorized, had something to do with variations in fetal brain development, though no precise explanation was given.
由于生活在一个为右撇子设计的世界里，左撇子承受着轻微不便带来的负担，在1980年他们中的一部分在生活中看起来恶化了，当时一项研究探讨了左撇子几倍于右撇子患慢性头痛和免疫疾病的风险。这种情况的原因虽然没有精确的说明，但从理论上说是在胎儿时期大脑成长过程中出现了变异。
But a raft of evidence now suggests that the migraine finding, though intriguing, was less fact than statistical artifact. A more extensive study published in March by German scientists examined a group of 100 patients who had received a diagnosis of migraine based on standards set by the International Headache Society. After finding no evidence of a link between handedness and migraines, the scientists pooled data from five other studies and conducted a meta-analysis. Still, there was no evidence of a relationship — a conclusion echoed by many similar studies.
但现在虽然有些令人困惑，但大量的证据提示偏头痛在这方面小于统计事实。一个更大规模研究在三月份被德国科学家们公布：一组100个病人通过国际头痛协会设置的标准接受了诊断。诊断后发现无法证明左右手习惯和偏头痛发病率有关，科学家们从其他5个研究中引用数据，并且进行了荟粹分析。结果仍然是无法证明两者关系 – 一个被许多相似研究回应的结论。
Several studies have also examined whether there is any relationship between left-handedness and increased risk of immune disorders. The findings are inconclusive. Proponents argue that fetal exposure to high levels of testosterone could be responsible, and they point out that left-handedness is more common in men than women. Critics say more research is needed.
几个研究也调查了是否左手习惯增加免疫系统疾病的风险。但这些发现还不确定。拥护者认为胎儿时期有高水平的睾丸酮水平能够被作为原因，并且他们指出左撇子通常男性高于女性。评论家说还需要做更多的研究。
THE BOTTOM LINE Most studies have found that being left-handed does not increase the risk of migraines.
下面联接到更多发现左撇子不增加偏头痛风险的研究。
还有研究说 左撇子基因更易引发精神分裂!
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