Erb H N, Martin S W
Can J Comp Med. 1978 Jan;42(1):1-9.
A total of 5,990 occurences of the diseases abomasal displacement, cystic graafian follicles, endometritis, hypocalcemia, ketosis, mastitis, metritis, ovarian hypofuction, pyometra and retained placenta were included in a case control study. The study was based on a hospital population of Holstein, Ayrshire, Guernsey and Jersey cows who were at least two years of age. The data were retrieved from computer storage of material abstracted for the Veterinary Medical Data Program. The transcription of data from original case records to these abstracts was examined as a source of error. An attempt was made to define each of the diseases by reference to random samples of the clinical records. Using the log-odds method, trends were noted for the youngest cows to be at increased risk of the reproductive diseases and for the Guernsey cows to be at increased risk of the uterine diseases. There was a tendency for peaks in disease occurrences in the winter (as opposed to summer) months.
一项病例对照研究纳入了总共5990例真胃移位、囊性格拉夫卵泡、子宫内膜炎、低钙血症、酮病、乳腺炎、子宫炎、卵巢功能减退、子宫蓄脓和胎盘滞留等疾病病例。该研究基于荷斯坦、艾尔夏、根西和泽西奶牛的医院群体，这些奶牛至少两岁。数据从兽医医学数据项目提取的材料的计算机存储中检索。对从原始病例记录到这些摘要的数据转录作为误差来源进行了检查。试图通过参考临床记录的随机样本对每种疾病进行定义。使用对数优势法，注意到最年轻的奶牛患生殖疾病的风险增加，以及根西奶牛患子宫疾病的风险增加的趋势。在冬季（与夏季相对）月份疾病发生有高峰的趋势。
