At the beginning of week 38, -2 weeks before the due date-, 2 out of 10 women already gave birth.
At the beginning of week 39, -1 week before the due date-, 4 out of 10 women gave birth.
At the beginning of week 40, -the due date-, 7 out of 10 women gave birth.
At the beginning of week 41, -1 week after the due date- 9 out of 10 women gave birth.
those stats don't make sense? So out of the 10 women, it adds up to 22 women. Not very helpful, unless I'm reading it totally wrongly.