The ratio of total live births to total population in a specified community or area over a specified period of time. The birthrate is often expressed as the number of live births per1, 000 of the population per year.

• 出生率某一特定集团或区域在指定时间段内总出生人口与总人口的比率。出生率常以每年每1000人口中的出生人数来表示