Tu E J
Am J Public Health. 1979 Oct;69(10):1052-5. doi: 10.2105/ajph.69.10.1052.
Data on New York State maternal mortality, 1917-1972, are analyzed and show that the cohort patterns of age-specific maternal mortality are mainly a reflection of the pattern of period declines in age-specific maternal mortality.
对1917年至1972年纽约州孕产妇死亡率数据进行了分析,结果表明,特定年龄组孕产妇死亡率的队列模式主要反映了特定年龄组孕产妇死亡率的时期下降模式。