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目的：研究福州地区新生儿实际出生日期与预产期差异（“预产日差”DBED）的基本规律，以及与传统预产期计算公式的异同点。方法：作者收集福州地区一家大型综合性医院1982～1995年单胎活产、非早产、无并发症、非手术产的正常分娩8463例新生儿登记资料，以SPSSforWindows（V7.5）软件包进行统计分析。结果：发现总平均预产期比传统算法提早近1.5日（1.47日）;各年份、月份、性别、城乡、常见胎产次、常见胎位（枕）和各周日多有此趋势。结论：建议“以末次月经的月份加9（或减3）、日数加5或6”作为预产期，可比传统的章法更准确1.5日。
Objective: To study the basic rules of the difference between the actual birth date and the expected date of birth (“birth date difference”) in Fuzhou and the similarities and differences with the traditional expected date of birth. METHODS: The authors collected 8,463 newborns from normal delivery of a single live birth, non-premature birth, non-complication and non-surgical birth in a large general hospital in Fuzhou from 1982 to 1995. The data were collected with SPSS for Windows (V7.5) software package Statistical Analysis. Results: It was found that the average expected date of birth was 1.5 days (1.47 days) earlier than the traditional algorithm. This trend was more common in all the years, months, sexes, urban and rural areas, common births, common fetal bones and every Sunday. Conclusion: It is recommended that “the month of last menstruation plus 9 (or minus 3) days plus 5 or 6” be the expected date of birth, which is more accurate than the traditional one.