The occurrence of first antenatal visits was highest between the 16th to 28th weeks of pregnancy, with visits during this stage accounting for close to two thirds (62.9 percent) of all first visits.
第一次检查的最高峰是在怀孕的第16周到第28周。 这阶段的检查人数是所有检查人数的近2/3（62.9%）。