It was obviously that the average maternal age
of the pregnant in 2020 is more advanced compare with 2019,even merely
about one year gap. This result confirmed the global trend of
postponement of child birth, both in developing and developed countries.
An increasing number of well-educated women whom stepping into the
workforce, with better and higher education, work and socioeconomic
pressure, attitude to marriage and fertility make their maternal age
been prolonged continually. The average age of primipara was 21 years in
1972 and in 2016 it reached 26.3 years[8].Advanced
maternal age is usually defined as being 35years, which is believed to
relate to varying complication and adverse
outcomes[9].In our study, maternal age of two
group women was less than 35 and little different existed in absolute
value. Therefore, the impact of age can be ignored from the discussion
of the
result.