3.2 The characteristics of exercise during each
trimester
During the 3rd trimester and throughout pregnancy, the distribution of
time spent was statistically different between the preterm and full-term
women (P =0.005; P =0.045). The distribution of energy
expenditure was statistically different during the 3rd
trimester(P =0.007). More details were provided in supplementary
material Table S1. Besides, for the patterns of exercise, most subjects
(90.64%) chose the option of walking.