Archer V E
Am J Epidemiol. 1979 Jan;109(1):88-97. doi: 10.1093/oxfordjournals.aje.a112663.
The mortality rates from anencephalus from 1950-1969 in Canadian cities are shown to be strongly correlated with city growth rate and with horizontal geomagnetic flux, which is directly related to the intensity of cosmic radiation. They are also shown to have some association with the magnesium content of drinking water. Prior work with these data which showed associations with magnesium in drinking water, mean income, latitude and longitude was found to be inadequate because it dismissed the observed geographic associations as having little biological meaning, and because the important variables of geomagnetism and city growth rate were overlooked.
1950年至1969年加拿大城市无脑儿的死亡率与城市增长率以及水平地磁感通量密切相关，而水平地磁感通量与宇宙辐射强度直接相关。研究还表明，无脑儿死亡率与饮用水中的镁含量也存在一定关联。先前对这些数据的研究显示与饮用水中的镁、平均收入、纬度和经度有关联，但这些研究被认为是不充分的，因为它们将观察到的地理关联视为生物学意义不大而不予考虑，并且忽略了地磁和城市增长率这些重要变量。
