Does anyone know which column were meant to look at?
The first two columns are identical, so I'm not sure why they have two. The last column is based on statistics involving other pregnant ladies, while the first one is just general statistics and probability based on the 50% chance of going into labor on your due date.
For me it shows: 8% of women actually have their baby on the due date; 23.6% have the baby within 3 days; within 5 days 38.3%; and 51.6% within 7 days. So 8% of women actually beat the odds at 50%.