Table 2.
Association Between Demographic and Ultrasonographic Factors and Activity Restriction Among Nulliparous Women With a Cervical Length Less Than 30 mm
| Activity Restriction (n=252) |
No Activity Restriction (n=394) |
P | |
|---|---|---|---|
| Treatment group | .35 | ||
| Active | 131 (52.0) | 190 (48.2) | |
| Placebo | 121 (48.0) | 204 (51.8) | |
| Maternal age (y) | 21.0 (20.0, 25.5) | 20.0 (19.0, 23.0) | >.001 |
| Race or ethnicity | .009 | ||
| Non-Hispanic white | 63 (25.0) | 86 (21.8) | |
| Hispanic white | 9 (3.6) | 46 (11.7) | |
| Black | 140 (55.6) | 197 (50.0) | |
| Asian | 3 (1.2) | 4 (1.0) | |
| Other | 37 (14.7) | 61 (15.5) | |
| Insurance | .03 | ||
| Private | 66 (26.2) | 70 (17.8) | |
| Government | 172 (68.3) | 292 (74.1) | |
| Self-pay | 14 (5.6) | 32 (8.1) | |
| Estimated gestational age at cervical length measurement (wk) | 20.3 (19.4, 21.1) | 19.7 (18.7, 20.9) | <.001 |
| Cervical length (mm) | 23.7 (19.0, 26.5) | 26.5 (24.0, 28.3) | <.001 |
| Cervical funneling | 74 (29.4) | 77 (19.5) | .004 |
| If funneling, length of funnel (mm) | 14.8 (10.7, 19.4) | 13.0 (7.4, 19.2) | .07 |
| Intra-amniotic debris | 41 (16.3) | 35 (8.9) | .005 |
Data are n (%) or median (25th, 75th percentile) unless otherwise specified.