With this post we'd like to share with you a few stats results about average post-ovulatory temperatures (BBT) and pregnancy. These are preliminary results intended to give you some material for comments and feedback.
We looked at the average temperature between 1 and 10 Days Past Ovulation (DPO). The reason for looking particularly at this phase of the cycle is that we often see people looking at their average post-O temperatures as a potential early pregnancy sign.
For this study we have randomly selected a set of 1000 pregnancy charts and 1000 ovulatory charts (see the Chart Gallery for examples). For each chart we calculated the average temperature between 1 and 10 DPO.
The histogram below shows you the distribution of temperatures (in Fahrenheit) for pregnancy charts:
The histogram below shows you the distribution of temperatures (in Fahrenheit) for ovulatory charts:
In terms of more descriptive statistics here are a few interesting results:
Average: 98.07F (36.71C)
Median: 98.10 (36.72C)
Standard Deviation: 0.28
Non Pregnant Charts:
Average: 98.04F (36.69C)
Standard Deviation: 0.32
Statistically we did not find any strong evidence that the averages are different between the two samples (t-test for the stats wizzes among you).
That said the pregnancy histogram shows a difference with the non pregnant one in terms of standard deviation (the shape of the distribution is sharper on the pregnancy histogram compared to the non pregnant one).