Roberts C J, Laurence K M, Lloyd S
Br J Prev Soc Med. 1975 Sep;29(3):202-4. doi: 10.1136/jech.29.3.202.
Altogether 406 infants with neural tube defects born in Cardiff between 1956-71 were investigated for evidence of space-time clustering and 100 similarly affected infants, together with matched controls born in Cardiff between 1964-66 were investigated for evidence of spatial clustering. No evidence of excessive prevalence in either dimension was observed.
对1956年至1971年间在加的夫出生的406例神经管缺陷婴儿进行了调查,以寻找时空聚集的证据,并对1964年至1966年间在加的夫出生的100例受类似影响的婴儿以及匹配的对照进行了空间聚集证据的调查。在这两个维度上均未观察到患病率过高的证据。