Noller K L, Resseguie L J, Voss V
Department of Obstetrics and Gynecology, University of Massachusetts Medical School, Worchester, USA.
Am J Obstet Gynecol. 1996 Apr;174(4):1192-7; discussion 1197-9. doi: 10.1016/s0002-9378(96)70661-0.
Our purpose was to determine whether there is a relationship between changes in atmospheric pressure and spontaneous onset of labor in term pregnancy.
All women admitted to Medical Center of Central Massachusetts-Memorial Hospital with spontaneous onset of labor at term and who were delivered on the service during a 12-month period represent the cohort for this study. Each maternal chart was abstracted to ensure that each member of the cohort met the inclusion criteria. Hourly recordings of atmospheric pressure made at the Worcester Station of the National Weather Service, Department of Commerce, were used as the meteorologic data points of interest. Least-squares regression was used to determine an equation that expresses the probability of the onset of labor in this cohort as a function of gestational age, which was used to calculate expected numbers for the statistical analyses. Two relationships were studied: (1) the ratio of the observed to the expected number of onsets of labor and (2) the initiation of labor and atmospheric pressure changes in the preceding 3 hours.
Three-hour periods of falling atmospheric pressure were less often followed by initiation of labor than were the periods with other types of pressure sequences. No association was observed between the onset of labor and days of low mean pressure.
Although there was an observed statistically significant association between falling barometric pressure and onset of labor, the magnitude of the difference is not of clinical significance.
我们的目的是确定大气压变化与足月妊娠自然发动分娩之间是否存在关联。
所有入住马萨诸塞州中部医疗中心 - 纪念医院且足月自然发动分娩并在12个月期间在该科室分娩的女性构成了本研究的队列。对每位产妇的病历进行摘要提取，以确保队列中的每位成员均符合纳入标准。将美国商务部国家气象局伍斯特站每小时记录的大气压作为感兴趣的气象数据点。采用最小二乘法回归确定一个方程，该方程将该队列中分娩发动的概率表示为胎龄的函数，用于计算统计分析的预期数值。研究了两种关系：（1）观察到的分娩发动次数与预期次数的比率；（2）分娩发动与前3小时内大气压变化的关系。
与其他类型气压序列的时间段相比，大气压下降3小时的时间段后较少出现分娩发动。未观察到分娩发动与平均气压低的日子之间存在关联。
尽管观察到气压下降与分娩发动之间存在统计学上的显著关联，但差异幅度无临床意义。
