BiSC participants’ places and trips

Do you remember that during the pregnancy we asked you two times to carry a phone with you for a week? These phones recorded GPS data that allow us to study transportation, movement patterns, and exposure to traffic, trees and other environmental factors during the pregnancy.

We have analysed this GPS data to understand how travel differs between the first trimester and the third trimester, and we found some interesting results. For example, the time spent at home each day (excluding the sleeping hours of the night) was on average around 3 hours higher in the third trimester than in the first trimester. In addition, the average distance away from home was about one kilometer smaller in the third trimester compared to the first trimester. These results indicate that daily life is more centered around the home in the third trimester. Importantly, these are the numbers we found when we excluded the effect of the COVID-19 pandemic.

But we also found that some things do not change between the first trimester and the third trimester. For example, in both trimesters it was common to visit around 10 places outside the home in a week, and it was common to make around 5 trips in a day. These numbers were not different when comparing the two trimesters. So it seems that even if more time is spent at home or close to home later in the pregnancy, the number of places visited and trips undertaken does not change.

These results help to create an understanding of pregnant women’s daily life and the places visited, which is of great importance for studying the effects of exposure to different environmental factors. In the coming analyses, we will use these GPS data to understand in detail how much greenery the participants were exposed to in pregnancy.

This post has been written by Karl Samuelsson, postdoctoral researcher at the BiSC Project.