<prompt> Percentage of women who deliver on the expected date of delivery is4153570  <response>: Based on Naegele;s formula labor stas approximately onExpected date in 4One week either side in 502 weeks earlier and 1 week later in 8042 weeks in 1043 plus weeks in 4D.C.DUTTA;S TEXTBOOK OF GYNECOLOGY, Pg no:113,7th edition 