I don't know where you can get those stats from but I remember that in the Belly Buddy group I was in about 50% went early & 50% went late (based on EDD). I don't remember anyone going on the due date, but I could be wrong.

Some of those who went late were 2nd or 3rd time mums and some of those who went early were first time mums so no trend there either. I was a first time mum and gave birth at 38/4.