Not A Normal Distribution

So, I’m feeling grumpy today. Just am. Not sure why. And then I go and stupidly read an article in on the BBC News website about most babies being born at 4am. You can read the article here and I’ll be taking quotations from it.

Four o’clock in the morning is the time most babies are born spontaneously in England, with the majority arriving between 01:00 and 07:00, a study shows.

So, four o’clock is the “average” of 01:00 and 07:00. Is that how they worked this out? I’m not sure. I’m probably not going to read the original paper but it does seem a strange thing to say. Assuming that spontaneous births are reasonably random the actual number arriving at 04:00 would be quite small and the variation could be little.

While planned C-section births tended to happen on weekday mornings, births after induced labours were more likely to occur around midnight.

This makes sense. C-Sections in the morning to then make sure everyone is fine during the time when the medical cover is best. Inductions probably happen at that time because they are started in the morning and it takes that long for the effects to show. These are not surprising figures and make utter sense.

It’s this next bit that turned me into a rage.

Overall, more than 70% of births took place outside regular working hours.


The researchers said there could be implications for staffing of midwives and doctors, with only 28% of births taking place between 09:00 and 17:00 on weekdays.

So, an event that is reasonably random is spread throughout the day? About thirty percent of births happen in a time frame covering roughly 30% of the amount of time in a day. THIS IS WHAT WE WOULD EXPECT. The working day covers 1/3 of the 24 hours in a day and the number of births in that time period is about 1/3. This sentence made me swear out loud in our staff common room earlier today, much to the ammusment of my colleagues.

I’m going for a walk to calm down.