A total of 390 women were included in the two trials: 269 in cohort 1 and 121 women in cohort 2. Of these women, 139 completed both baseline and late pregnancy data collection. Due to lack of compliance of the participants, data on objectively measured PA and sedentary behaviour were available for 111 (80%) women with a singleton pregnancy. They comprised the study sample for the analyses. The baseline characteristics of the study population and the outcome measures are presented in Table 1. The mean GWG was 10.3 (SD 4.3) kg, with an average of 0.55 (SD 0.22) kg per week and mean birth weight was 3545 (SD 441) g.