Percentages of domain-specific moderate-to-vigorous physical activity (MVPA) in hours/week at 17–22 weeks gestation by quartile of total MVPA among women enrolled in the third phase of the Pregnancy, Infection, and Nutrition Study with any MVPA. (a) 1st quartile n=203, range 0.03–1.17 (b) 2nd quartile n=202, range 1.23–2.53 (c) 3rd quartile n=206, range 2.57–5 (d) 4th quartile n=200, range 5.07–63.