Table 11.
Variables in 2 datasets with ultrasound measurements added and updated at visit 2 and visit 3
| Dataset U1 | Dataset U2 | Dataset U3 |
|---|---|---|
| Height (cm) | ||
| Marital status | ||
| Race Hispanic | ||
| Race Asian | ||
| Race Other | ||
| Race Non-Hispanic White | ||
| Race Non-Hispanic Black | ||
| BMI category at Visit 1 | ||
| Number of pregnancies | ||
| Age (years) at visit 1 | ||
| Age category (years) at visit 1 | ||
| Education status attained | ||
| Income as % of 2013 federal poverty level | ||
| Poverty category based on income and household size | ||
| Vitamin D, mcg | ||
| Vitamin D from supplements | ||
| Pre-gestational diabetes | ||
| Assisted reproduction for this pregnancy | ||
| Previous surgeries - Cervical surgery - Cone | ||
| Previous surgeries - Cervical surgery - LEEP | ||
| Previous surgeries - Cervical surgery - Cryotherapy | ||
| Previous surgeries - Abdominal surgery excluding uterine surgery | ||
| How often do you take Stress-Tabs, B-complex? | ||
| How often do you take Vitamin D, alone, w/ calcium? | ||
| Ever used any tobacco products including cigarettes and smokeless tobacco? | ||
| Smoked tobacco in 3 months prior to pregnancy? | ||
| Used smokeless tobacco in 3 months prior to pregnancy? | ||
| Family history of hypertension | ||
| Family history of Spontaneous preterm delivery (<37 weeks) | ||
| Family history of Early or preterm rupture of membranes | ||
| Family history of Preeclampsia, eclampsia, toxemia or pregnancy-induced hypertension | ||
| BMI at Visit 1 | BMI at Visit 2 | BMI at Visit 3 |
| Diabetes at Visit 1 | Diabetes at Visit 2 | Diabetes at Visit 3 |
| Hypertension at Visit 1 | Hypertension at Visit 2 | Hypertension at Visit 3 |
| Vaginal bleeding until Visit 1 | Vaginal bleeding until Visit 2 | Vaginal bleeding until Visit 3 |
| Vaginal bleeding days | Vaginal bleeding days since Visit 1 | Vaginal bleeding days since Visit 2 |
| Tobacco smoke last month at Visit 1 | Tobacco smoke last month at Visit 2 | Tobacco use last month at Visit 3 |
| Smokeless tobacco last month at Visit 1 | Smokeless tobacco last month at Visit 2 | Smokeless tobacco last month at Visit 3 |
| Cervical length (mm) at Visit 2 | Cervical length (mm) at Visit 3 | |
| Left uterine artery PI at Visit 2 | Left uterine artery PI at Visit 3 | |
| Right uterine artery PI at Visit 2 | Right uterine artery PI at Visit 3 | |