FIGURE 2.

Categorization scheme for free-text responses to the question, “Did anything happen or did you do anything that you think may have made your labor start when it did?” NOS = not otherwise specified; ROM = rupture of membranes; SROM = spontaneous rupture of membranes. Numbers shown are total numbers of women, and women were allowed more than one answer. Therefore, a woman who reported both walking and swimming would appear in each of those categories in the far left column but only once in the “exercise” category in the middle column.