Figure 2. Association of Physical Activity Patterns With Preterm Birth.

A, Distribution of daily moderate-to-vigorous-intensity physical activity (MVPA) on the 2 most active days of the week vs the remaining days among individuals with different active physical activity patterns. B, Association of physical activity patterns with preterm birth. Logistic regression was used to estimate the difference in odds ratios (ORs) of preterm birth between 2 active physical activity patterns and inactive group (MVPA <30 min/d), adjusting for age, gestational week at baseline, prepregnancy body mass index, physical activity energy expenditure, household income, educational level, smoking, alcohol drinking, and parity.